OS Giken STR Twin Plate Clutch diffuser The Evolution system increases the

The Evolution system increases the E9x M3’s power output by 22 horsepower with a re-engineered x pipe and removal of the factory catalytic converters

These look excellent while rolling too

FIA certified and crash tested

The GTX03 features a popular 5 spoke design for a distinguished look

FRP construction

OS Giken STR Twin Plate Clutch diffuser The Evolution system increases theDesigned for high power with relatively light clutch pedal in endurance racing STR2C: Solid hub clutch disks rated for 575 lb ft of torque STR2CD: Sprung hub clutch disks rated for 575 lb ft of torque Overhaul Kit A Clutch Friction Discs Pressure Plate Overhaul Kit B Overhaul Kit A + Replacement Clutch Cover