Unlike single-stud or rivnut mounts, the WPM A90 half cage bolts to low-profile plates welded to the side impact beam and rear frame rails—the same idea as BMW’s own GTS cages—so you get a chassis-tied mount and more interior room. The bar can come back out while the plates stay under the trim.
- Docol R8, TIG welded, about 38.5 lb
- Weld-in base plates; the bar bolts on and can be removed
- Plates hide under OEM trim if the bar is removed
- Keeps the full OEM interior with notching of the sub box and trunk side carpets
- Powdercoat included
Professional installation strongly recommended; WPM installs in-house. Non-sunroof cars only. Made to order in the USA.