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Other items worth swapping beyond weight savings if building a track car:
1M Bodywork - increase track width allowing more tire and wider fronts.
PPK Radiator Fan
PPK Aux Radiator
BMW 1M rear subframe, Diff, Hubs and front knuckles. This opens up options for larger aftermarket m3 brakes, M3 suspension, m3 coilovers and LSD Options. Most aftermarket brake companies only make as large as a 355mm front rotor for 135i where they make 380mm kits for m3/1m. M3/1M also have a myriad of coilover kits not available on standard e82. You can swap in solid subframe and diff bushings before the m3 subframe goes in too.
Depending on the level of build, you can either use M3 control arms with aftermarket bushings or bimmerworld or similar heim jointed rear arms.
1M/M3 Steering rack: If you have an active steering e82 you can not only bolt in the m3 rack but you can code in the m3 servotronic settings.
Sunroof Delete - run a factory slick top and support bar or a Revozport carbon roof. Slicktop saves around 40lbs off the tallest part of the car.
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