[tylerhart_21]

Looking online and doing some research, I have found out that the e9x 335i uses the same piston as the e9x 328i (57mm). But they use a different rotor and pad size. In addition the e9x m3 uses a 60 mm piston (Key note). On the e60 brake caliper (any non-m) they use a 60 mm piston and a 30 mm (pad I believe). The numbers on the caliper are 60/30/X. The bigger piston is within the 3.17 mm limit that is suggested and is based on the Alpinas where they give the b3 the same calipers as the 5 series. Plus the difference you would be getting is the braking/clamping force. My question is would doing down the e60 brake caliper route would be the best?