This part was created in our World Challenge race program and through a partnership with Diffsonline, is now available for public purchase. This starts life as a stock ZF transmission 5-speed (that BMW charges $2,280 plus core for). It is completely rebuilt to stock specs to make shifting smoother and faster. This transmission can be shifted as fast as a sequential box by an experienced driver!While the internals are out, all non-friction mesh and bearing surfaces are cleaned through REM polishing. This isotropic polishing process leaves gears and bearing surfaces mirror smooth, which reduces friction (heat and driveline power loss). In our cars, we saw a 2-3% reduction in driveline losses on a chassis dyno with this part alone (this equates to 6-10 Hp on an average M3 Prepared class engine!) - plus more time spent accelerating due to faster shifts.
This unit is stock on a E36 M3 and 328, E46 328 and 330, and some others. Can be retrofitted to most race applications. Call with further questions or specifications. Price does not include $750 core charge for an acceptable piece (no junk please!). Customer responsible for return core shipping.
