hi,if u want to put M3 front calipers,u must change the King pin,because they are different with the non M ( caliper fixation is 8 mm larger) and put a spacer for ur rims or install 17 rims
for the rear if u put M3 breaks,u couldnt use ur handbrake,and must do a adapter,its better to put Z3M or Z4 break with 125i rotor,
Last edited by samdemange; 07-01-2015 at 11:09 PM. | 
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