{"product_id":"ap-racing-by-essex-radi-cal-competition-brake-kit-rear-cp9449-340mm-e9x-m3-1m-copy-copy","title":"AP Racing by Essex Radi-CAL Competition Brake Kit (Rear CP9449\/340mm) - E9x M3 \/ 1M (Copy) (Copy)","description":"\u003ch2\u003eAP RADI-CAL E9X M3 \/ 1M REAR BRAKE KIT!\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe end-all BBK for your \/\/M. A kit that \u003cem\u003ealmost\u003c\/em\u003e needs no introduction, but we'll give you one anyway. To start, here are some key factors in why the AP Essex kit is our stopper of choice. This front kit in particular is the endurance caliper, with massive 25mm pads.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003eComplete\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003efront\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAP Racing by Essex Radi-CAL Competition Brake Kit for E92 M3 \u0026amp; 1M Coupe\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFeatures AP Racing CP9660 Radi-CAL calipers\u003c\/li\u003e\n\u003cli\u003e372x34mm 72 vane AP Racing \u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv class=\"product-summary\"\u003e\n\u003cp\u003eComplete\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003erear\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAP Racing by Essex Radi-CAL Competition Brake Kit for the E90\/E92\/E93 M3 \u0026amp; 1M Coupe.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRetains OEM parking brake functionality\u003c\/li\u003e\n\u003cli\u003eEliminates 17 unsprung lbs. from rear of car\u003c\/li\u003e\n\u003cli\u003eFeatures AP Racing CP9449 Radi-CAL four piston calipers\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.essexparts.com\/ap-racing-j-hook-competition-disc-replacement-ring-340x28mm-right-hand\" target=\"_blank\"\u003e340x28mm 48 vane heavy duty AP Racing discs\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eEvery component designed to resist the heat of extended track sessions\u003c\/li\u003e\n\u003cli\u003ePistons sized properly to allow for seamless integration with OEM master cylinder and ABS system\u003c\/li\u003e\n\u003cli\u003eDesigned to complement either of\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"https:\/\/www.essexparts.com\/my-vehicle\/2008\/BMW\/M3\/%20E92?ctg%5B%5D=257\" target=\"_blank\"\u003eour front e90 Front Essex\/AP Racing Radi-CAL Competition BBK's\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cb\u003eFits:\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003eRear (2009 BMW M3 E92 Coupe)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTHE ASYMMETRIC DESIGN OF THE CALIPER PROVIDES THE BEST PEDAL FEEL WE HAVE EVER HAD IN ANY ROAD OR RACE CAR.\u003c\/h3\u003e\n\u003cp\u003eWhat this means is we achieve similar levels of caliper rigidity as the monobloc calipers from top ends of motorsport like NASCAR and F1 in a package that's much more affordable. \u003c\/p\u003e\n\u003ch1\u003eWhat's In The Box?\u003c\/h1\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/9660%20complete%20bbk%20pic_2.jpg\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOne pair AP Racing CP9449 Radi-CAL Pro5000R six piston calipers\u003c\/li\u003e\n\u003cli\u003eOne pair 372x34mm AP Racing CP7177, 72 vane, J Hook racing discs, with fully floating 6061 hard anodized aluminum hats, and attachment hardware\u003c\/li\u003e\n\u003cli\u003eOne pair caliper mounting brackets and hardware\u003c\/li\u003e\n\u003cli\u003eOne pair Spiegler Stainless Steel Brake Lines with abrasion resistant coating\u003c\/li\u003e\n\u003cli\u003eDetailed installation instructions\u003c\/li\u003e\n\u003cli\u003eBrake pads are\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eNOT\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eincluded with our system. Racing brake pads are a highly personal choice. Many manufacturers include a set of inexpensive, low quality pads with their brake kits. Rather than artificially inflating the price of our system with a set of pads you probably don't want anyway, we've decided to remove the cost from our system and allow our customers to choose the pads that best suit their needs\/wants. When purchasing our kit, you are able to choose one set of front pads at a substantial discount vs. the retail price. Please use the drop-down menu to select your pads.\u003c\/li\u003e\n\u003cli\u003ePad Tension Clips (frequently referred to as anti-rattle clips) are\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eNOT\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eincluded with our Competition Kits, but we do offer them as an option if you're concerned about NVH. One of the great benefits of the AP Racing calipers in our system is that they are designed to accommodate pads from a wide range of manufacturers. Each manufacturer builds their pads with specifications that are slightly different. As such, pads from different manufacturers, or even from different batches, won't always fit in the calipers in exactly the same manner. Some pads are a snug fit, while others may rattle around and produce noise. The Essex Designed Pad Tension Kit is designed to dramatically reduce pad movement inside the caliper, along with just about all resulting noise.\u003cspan\u003e \u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/34340984792_d91e115bcf_b.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/34501500885_a3f7a7b4af_b_2.jpg\"\u003e\u003c\/p\u003e\n\u003ch1\u003eRadi-CAL\u003c\/h1\u003e\n\u003cp\u003e“Radi-CAL” is a blanket term used to describe AP Racing’s patented asymmetrical brake caliper design. Radi-Cal technology is grounded in Computer Aided Design (CAD) and Finite Element Analysis (FEA), and allows for organic, alien-looking designs that are a radical departure from conventional caliper designs of the past. Radi-CAL's are widely considered the pinnacle of current brake caliper technology. Since their inception in 2007, these revolutionary calipers have amassed a lengthy string of race victories at all levels of professional motorsport, while redefining brake performance expectations. For more details on the design concept and what these calipers have achieved in professional racing,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eplease visit our blog and read\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/www.essexparts.com\/news-blog\/the-ap-racing-radical-story\" target=\"_blank\"\u003eThe AP Racing Radi-CAL Story\u003c\/a\u003e.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe key benefits of the Radi-CAL design:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMassive Stiffness Increase\u003c\/strong\u003e- A 30+ % increase in both static and dynamic stiffness vs. conventional calipers allows for far less deflection under load, which means superior pedal feel \u0026amp; modulation, more even pad wear, and longer caliper service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsiderable Mass Reduction\u003c\/strong\u003e- Removing all extraneous caliper mass lowers the caliper weight, despite the huge stiffness increases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Airflow\u003c\/strong\u003e- Air moves around and through the caliper more efficiently, providing superior heat evacuation and cooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEfficient Packaging\u003c\/strong\u003e- The asymmetric caliper profile and internal fluid porting allows the caliper to fit into tighter spaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1\u003eCalipers\u003c\/h1\u003e\n\u003ch2\u003eCP9660 Pro5000R, The Everyman Radi-CAL\u003c\/h2\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/9660a.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003eIt has taken eight years, numerous generations of the design concept, and advancements in manufacturing techniques, but the Radi-CAL has finally evolved into a viable solution for racers and enthusiasts of all levels and budgets. While many products are\u003cspan\u003e \u003c\/span\u003e\u003cem\u003esupposedly\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eborn in racing, there can be no doubt about the Pro5000R pedigree. These calipers are direct descendants of the current crop of F1 and Sprint Cup calipers. They don't look ordinary, because they're\u003cspan\u003e \u003c\/span\u003e\u003cem\u003enot\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003eordinary. They're the epitome of pure racing design: elegant, sparse, and brutally effective. And while they embody and employ the Radi-CAL design philosophy of the past, they also add some outstanding new features that enhance their practicality, convenience, and appeal. Quite simply, they are the lightest, stiffest, and most technologically advanced brake calipers that have ever been within the average enthusiast's grasp.\u003c\/p\u003e\n\u003cp\u003eThese intricate calipers have traditionally been machined from proprietary aluminum alloy billets. As one can imagine, machining away all of that material to achieve the final form is both time-consuming and costly. As a result, the price of these calipers has historically been prohibitive for the average club racer, time-trialer, or HPDE participant. Fortunately, the Pro5000R calipers use a new drop-forging technique that has dramatically lowered the manufacturing cost and the resulting price of entry, bringing this incredible technology to the masses.\u003c\/p\u003e\n\u003ch3\u003eRadi-CAL = Massive Dynamic Stiffness Increase\u003c\/h3\u003e\n\u003cp\u003eOver the years, many different strategies have been employed to shrink the brake caliper footprint while maintaining adequate stiffness: More robust caliper bridge designs, two-piece calipers with steel through-bolts, exotic materials (i.e. Beryllium, MMC), forging rather than casting, monobloc design, etc. All of these innovations pushed calipers towards becoming lighter, smaller, and stiffer. However, until the advent of the Radi-CAL, the same basic rectangular, boxy shape remained the accepted standard.\u003c\/p\u003e\n\u003cp\u003eIs a rectangular box really the most appropriate and efficient shape for a brake caliper? AP Racing has now proven that it is not. As a brake caliper clamps brake pads against a spinning disc, a tremendous tangential friction force occurs between the pads and the spinning disc. In other words, the caliper is pulled strongly in the direction of the spinning disc, as represented by the downward pointing arrow on the right side in Figure 1 below. The caliper resists that force via the spindle hard mounting points, depicted by the upward arrow on the left. The dynamic load placed on the caliper twists or pulls the caliper into a parallelogram shape.\u003c\/p\u003e\n\u003cp\u003eFigure 1\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/Caliper%20Parallelogram%20Force.jpg\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg height=\"660\" width=\"343\" src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/parallelogram.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe dynamic force exerted on the calipers during a braking event is the key to the magic of the Radi-CAL design philosophy. Brake calipers of the past were designed to some extent in relative isolation from the forces that they were attempting to combat. They were designed to be the stiffest box possible while resting on a table, with much of the caliper mass residing at either end.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eThe Radi-CAL is dramatically different because it was deliberately designed around the braking event forces that will be acting upon it.\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThis is achieved by optimally distributing the body mass of the caliper on a diagonal, rather than at the two caliper ends. As such, the forces dynamically acting on the caliper are supported by the caliper mass, rather than what historically has been an empty box (see Figure 2 below). At the same time, this also allows for a significant reduction in overall mass, because all non-essential, non-load-bearing caliper body material is removed. So in the case of the Radi-CAL,\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eit's not just about the material that is put into the caliper, it's about the material that is taken away!\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFigure 2\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/Diagnoal%20Load%20Paths%20Conventional.jpg\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/Diagonal%20Load%202.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eWhat does the above mean for you, the driver? It means a significantly firmer brake pedal with superior modulation under all conditions. It also means more even pad wear with less tapering, and a longer caliper service life.\u003c\/h4\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003eRadi-CAL= Ultra-lightweight, Compact Design with High Airflow\u003c\/h3\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/9660g.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003eAs mentioned above, the Radi-CAL design philosophy is just as much about what\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eisn't\u003c\/em\u003e\u003cspan\u003e \u003c\/span\u003ethere, as it is about what is there. The Radi-CAL design relocates caliper mass, creating voids that would traditionally not be located where they are. As such, considerable mass is removed from the body, and the entire envelope of the caliper is optimized. The result is an extraordinarily lightweight and compact footprint.\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eWhereas many competing six piston calipers weigh in the 9-12 lb. range, the CP9660 weighs an astounding 6.1 lbs.!\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Essex mantra when designing brake kits has always been, \"Anything larger than necessary to get the job done is simply dead weight to drag around,\" and the Radi-CAL aligns perfectly with those values. One of the major problems with many of the brake packages currently on the market is wheel fitment. You’re offered gigantic discs and 12 piston calipers, with a pat on the back and a, “Good luck finding wheels to clear those things (insert sinister chuckle here).” The reality is that many casual racers want to use their OEM wheels on the track, or the smallest, lightest wheel they can find. Not only is saving unsprung weight critical, R compound tires are much more plentiful and cheaper for smaller wheels. If the components are designed properly with heavy use in mind, you don’t need to cram boat anchors under your wheels. If you’re worried about the loss of stiffness due to mass reduction, don’t. Some manufacturers use a heavier six piston caliper, but that's because the caliper wasn't designed or optimized for racing. In those cases, the same caliper may have been designed for use on much heavier road cars, and even trucks! AP Racing’s Pro5000R calipers are incredibly stiff, and designed from scratch with only the racetrack in mind.\u003c\/p\u003e\n\u003cp\u003eTake a look at the caliper above or below. Anything else missing? Outer bleed screws and crossover tubes! The Pro5000R range has internal fluid porting and only two bleed screws located on the inner caliper half. That means that the chance of knocking a bleed screw or denting a crossover pipe during a wheel change virtually disappears. It also means that you now have half as many bleed screws to turn when changing your brake fluid. Eliminating the piping and bleed screws also allows the outer corners to be rounded, improving wheel spoke clearance.\u003c\/p\u003e\n\u003cp\u003eFinally, take a look at the picture below. Compared to a traditional caliper, the pistons and brake fluid pathways have far more airflow between and around them, lowering the overall system operating temperature.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/9660e.jpg\"\u003e\u003c\/p\u003e\n\u003ch3\u003eTwo-piece, Drop-Forged Caliper Body\u003c\/h3\u003e\n\u003cp\u003eRadi-CAL's such as the one in Figure 2 above have traditionally been machined from a single, solid block of proprietary aluminum alloy (monobloc). With a monobloc design, the piston bores and piston seal grooves can only be machined with a right angle machine tool (the tool must be inserted up and into the caliper). As one can imagine, machining away all of that material with special tools and multiple setups to achieve the final form is both time-consuming and costly. As a result, the price of monobloc Radi-CAL's has historically been prohibitive for the average club racer, time-trialer, or HPDE participant. The Pro5000R has been made possible by a newly developed 2-piece drop-forging process, which allows a conventional machine tool to access the piston bores via a direct path. The result is a drastic reduction in both production time and cost, while still retaining an incredibly stiff form.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/9660d_2.jpg\"\u003e\u003c\/p\u003e\n\u003ch3\u003eHard Anodized Finish\u003c\/h3\u003e\n\u003cp\u003eThe first obvious weakness when looking at a typical aftermarket caliper is the finish. Most aftermarket calipers come in a painted finish, whether they are red, black, or gold. That painted finish is designed to look pretty and prevent corrosion in harsh winter environment. Unfortunately, for all of the compliments painted calipers generate, there is an associated price if you drive the car in a track environment. That price is the chipping, flaking, fading, color shift, and general degradation of that finish in a fairly short period of time. Some OEM calipers can go from the as-delivered color to a nasty shade of brown in as little as one weekend. While this is typically worn as a badge of honor among our more hardcore customers, let’s face it…they still look terrible. More importantly however, all of those bits of paint end up in places they’re not supposed to, which we’ll get to in a minute.\u003c\/p\u003e\n\u003cp\u003eWhy does this happen? Heat. Paint and powder coat cannot adequately handle track temperatures. Powder coat also has some notorious issues with shrinkage. The powder coat layer expands and grows when the caliper is heated. When it cools, the powder coat doesn’t necessarily shrink in step with the caliper body itself. What’s left is a loose shell of finish hanging limply on the caliper body. That shell then cracks and falls to pieces.\u003c\/p\u003e\n\u003cp\u003ePaint can also have similar issues depending on how it is applied. If you were to line up a few aftermarket calipers from the same manufacturer, you would likely see that the painted finish on each of those calipers is slightly different. Some have a thicker coat, some thinner, slightly different shades of red, etc. Painting is to some extent an art form, and must be performed in a tightly controlled environment. If it isn’t, you’re always going to see variation. A thick coat makes the part look soft around the edges, and is prone to cracking off in the same manner as the powder coat described above, leaving the underlying finish exposed. A part without enough paint will look uneven, and will not protect the underlying aluminum particularly well either. In addition to problems with cracking, flaking, and uneven application, paint and powder coat also experience extreme color shift when heated. Red becomes maroon or black, gold becomes brown, and black just gets uglier.\u003c\/p\u003e\n\u003cp\u003eThe calipers we are using in the Essex Radi-CAL Competition Kits are ultra-lightweight, stiff, and durable under all track conditions. The finish is a hard anodizing, which is the business under track conditions. When raw aluminum reacts with the oxygen in the air, a hard surface film develops on aluminum which prevents further degradation. The process is called oxidation, and you can think of it like rust. The anodizing process leverages this natural phenomenon, and takes it a step further to produce an extremely hard protective layer of aluminum oxide. It does so by running an electrical current through an acid bath, and dying it to the desired color. If you want to know more, Google it.\u003c\/p\u003e\n\u003cp\u003eThe result is a finish that is far more appropriate for racetrack use. Anodizing creates a uniform surface that is much more abrasion resistant than paint or powder coat. That means if you ding an anodized caliper with a box wrench when bleeding it, a big chunk of the finish isn’t going to chip off into your hand. While anodized calipers will still exhibit color shift, it will take a lot more heat to get them to change, and they won’t change as dramatically. More importantly though, you aren’t going to have bits of anodizing sticking to the sides of your pistons.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/9660h.jpg\"\u003e\u003c\/p\u003e\n\u003ch3\u003eBrake Pads in A Commonly Available Shape\u003cem\u003e\u003c\/em\u003e\n\u003c\/h3\u003e\n\u003cp\u003eThe basic pad shapes for the Pro5000R calipers were created by AP Racing many years ago, and are used by a wide range of racing calipers today. They're available in just about every popular racing compound on the market. That means you’ll never end up in a pinch without pads.\u003c\/p\u003e\n\u003cp\u003eBelow is a drawing of the basic pad shape:\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/storage\/wysiwyg\/Modified%20pad%20for%20Pro5000R.jpg\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/www.essexparts.com\/index.php\/admin\/cms_wysiwyg\/directive\/___directive\/e3ttZWRpYSB1cmw9Ind5c2l3eWcvQVBfUmFjaW5nL1BybzUwMDBSL01vZGlmaWVkX3BhZF9mb3JfUHJvNTAwMFIuanBnIn19\/key\/b8adb5af565f9341beb52393e3479006\/\" alt=\"Pad modification\"\u003eDimensions= 152.1 x 54 x 18 mm\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePad Retention Loop\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe basic pad shape above comes from some manufacturers with a small loop on the top edge (the portion above the red line in the drawing above). On certain calipers a pad retention pin is placed through that loop to hold the pads in place. That small loop is not used in the AP Racing Pro5000R Radi-CAL's however, and must be removed for the pads to fit properly (it can be sawed or ground off in a matter of seconds).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePad Thickness, CP9660 caliper (18mm) vs. CP9668 caliper (25mm)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor many of the platforms we are servicing, we have both the CP9660 and CP9668 calipers available. The biggest difference between these two calipers is the thickness of the pads that they can accommodate. The CP9660 caliper uses an 18mm thick pad in the above shape, while the CP9668 caliper uses a 25mm thick pad. Which one is right for you? If you're running multi-hour endurance races, or if you want to reduce the frequency of pad changes, the CP9668 is likely your proper choice. If you're running standard 20-40 minute HPDE\/Time Trial sessions, or sprint races, the 18mm thick pads will be more than ample. There are two primary tradeoffs when going with the CP9668 caliper: It is about a pound heavier (including the difference in pad weight), and roughly 14mm wider than the CP9660. You will lose that 14mm on wheel spoke clearance vs. the CP9660 kit, so please make sure to check both fitment templates if you're debating on caliper choice.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe available pad compounds that Essex sells for the CP9668 caliper can be found below. Please keep in mind that there are many other compounds available on the market from other manufacturers. The list below represents only what Essex sells. Underneath the manufacturer list below, the pad compounds are listed from most aggressive to least aggressive.\u003c\/p\u003e\n\u003cp\u003eWant to know more? Watch this video Essex brake engineer, Jeff Ritter, below.\u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"927\" height=\"521\" src=\"https:\/\/www.youtube.com\/embed\/tkqSjt0iaTs\" title=\"AP Racing Competition Brakes vs. Stock Porsche GT Car Brakes\"\u003e\u003c\/iframe\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"AP Essex","offers":[{"title":"No Pads \/ No \/ No","offer_id":52398325793051,"sku":"13.01.10053","price":4849.0,"currency_code":"USD","in_stock":true},{"title":"No Pads \/ No \/ Yes to pre-bedding","offer_id":52398325825819,"sku":"13.01.10053","price":4949.0,"currency_code":"USD","in_stock":true},{"title":"No Pads \/ Yes to pad tension kit \/ No","offer_id":52398325858587,"sku":"13.01.10053","price":4989.0,"currency_code":"USD","in_stock":true},{"title":"No Pads \/ Yes to pad tension kit \/ Yes to pre-bedding","offer_id":52398325891355,"sku":"13.01.10053","price":5089.0,"currency_code":"USD","in_stock":true},{"title":"DS 2500 (primarily street) \/ No \/ No","offer_id":52398325924123,"sku":"13.01.10053","price":5024.0,"currency_code":"USD","in_stock":true},{"title":"DS 2500 (primarily street) \/ No \/ Yes to pre-bedding","offer_id":52398325956891,"sku":"13.01.10053","price":5124.0,"currency_code":"USD","in_stock":true},{"title":"DS 2500 (primarily street) \/ Yes to pad tension kit \/ No","offer_id":52398325989659,"sku":"13.01.10053","price":5164.0,"currency_code":"USD","in_stock":true},{"title":"DS 2500 (primarily street) \/ Yes to pad tension kit \/ Yes to pre-bedding","offer_id":52398326022427,"sku":"13.01.10053","price":5264.0,"currency_code":"USD","in_stock":true},{"title":"DS1.11 (track\/street pads) \/ No \/ No","offer_id":52398326055195,"sku":"13.01.10053","price":5024.0,"currency_code":"USD","in_stock":true},{"title":"DS1.11 (track\/street pads) \/ No \/ Yes to pre-bedding","offer_id":52398326087963,"sku":"13.01.10053","price":5124.0,"currency_code":"USD","in_stock":true},{"title":"DS1.11 (track\/street pads) \/ Yes to pad tension kit \/ No","offer_id":52398326120731,"sku":"13.01.10053","price":5164.0,"currency_code":"USD","in_stock":true},{"title":"DS1.11 (track\/street pads) \/ Yes to pad tension kit \/ Yes to pre-bedding","offer_id":52398326153499,"sku":"13.01.10053","price":5264.0,"currency_code":"USD","in_stock":true},{"title":"DS3.12 (track pads) \/ No \/ No","offer_id":52398326186267,"sku":"13.01.10053","price":5024.0,"currency_code":"USD","in_stock":true},{"title":"DS3.12 (track pads) \/ No \/ Yes to pre-bedding","offer_id":52398326219035,"sku":"13.01.10053","price":5124.0,"currency_code":"USD","in_stock":true},{"title":"DS3.12 (track pads) \/ Yes to pad tension kit \/ No","offer_id":52398326251803,"sku":"13.01.10053","price":5164.0,"currency_code":"USD","in_stock":true},{"title":"DS3.12 (track pads) \/ Yes to pad tension kit \/ Yes to pre-bedding","offer_id":52398326284571,"sku":"13.01.10053","price":5264.0,"currency_code":"USD","in_stock":true},{"title":"DSUNO (track pads) \/ No \/ No","offer_id":52398326317339,"sku":"13.01.10053","price":5024.0,"currency_code":"USD","in_stock":true},{"title":"DSUNO (track pads) \/ No \/ Yes to pre-bedding","offer_id":52398326350107,"sku":"13.01.10053","price":5124.0,"currency_code":"USD","in_stock":true},{"title":"DSUNO (track pads) \/ Yes to pad tension kit \/ No","offer_id":52398326382875,"sku":"13.01.10053","price":5164.0,"currency_code":"USD","in_stock":true},{"title":"DSUNO (track pads) \/ Yes to pad tension kit \/ Yes to pre-bedding","offer_id":52398326415643,"sku":"13.01.10053","price":5264.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/2123\/2667\/files\/RacewerkzAPFrontKit_1300x_6ac28cba-21e0-44d5-9fde-fac1b435740e.jpg?v=1682376406","url":"https:\/\/www.sub2speedhouse.com\/products\/ap-racing-by-essex-radi-cal-competition-brake-kit-rear-cp9449-340mm-e9x-m3-1m-copy-copy","provider":"SUB2 SPEEDHOUSE","version":"1.0","type":"link"}