My inspiration for swapping steering wheels are cars from Munich's heritage past, like the 3.0 CSL, 2002tii, E30, and early M5s. The Prototipo was also found on Porsche 911s and Alfas of that era. Having a Prototipo wheel in this car is my hommage / tip of the hat to those exciting and memorable BMWs.
I chose the 6C carbon fiber finish because I felt the material updated the retro Prototipo style into a period correct wheel for the E90.
The most time-consuming challenge on this project was locating a satisfactory BMW roundel for the MOMO horn button. BMW quashed the MOMO-sourced roundels. The DIYs I found online mostly used silly expensive ($150+) plastic imitations from Ebay, or sad-looking foil roundels similar to the ones on our airbag modules. Neither option is satisfactory in appearance.
I dug through the BMW motorcycles product catalog for a solution and found a 41 mm OEM roundel with perfect fitment on the MOMO horn module, a 3D design, and very aesthetic appearance. This part is noticeably superior to even the NOS MOMO horn buttons, and miles ahead of the alternatives. Price is < $20.
BMW motorcycles part # 46542300045
The correct MOMO hub adapter is # 2013
A Prototipo steering wheel in a 2002:
...and another in an Alfa Romeo:
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2011 6MT RWD ClubSport Wagon | 3,185lbs | 1 of 149 ZSPs delivered in North America
Outside: BMW M-Aero, Euro region lighting, Seibon | Inside: M3 cockpit, Recaro SPG, Prototipo, AutoSolutions SSK, UCP | Stop: M3 ST-40R, PFC | Grip: Solid-mounted subframes, rear coilover conversion, M3 Nitron R3, Hyperco, SPL, AKG, ARC8 | Go: StageFP, CF snorkel, 3IM, MILVs, SuperSprint headers, Dundon Motorsports Inconel exhaust, VoltPhreaks | Cool: CSF | PCA #2018100384 | BMW CCA #505794