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purposeful tone without harsh resonance or motorway drone
Choose the style that matches your driving:
STG 1 Power increased to 155BHP and 240NM of torque
STG 1 Power increased to 330BHP and 750NM of torque
additional chassis upgrades
BC RACING COILOVERS ER SERIES - BMW 3 SERIES E90 05-11 model-M135i (F20/F21) including xDrive purposeful tone without harsh resonanceThe BC Racing ER Series is a high performance coilover system featuring external reservoirs and completely separate compression and rebound damping adjustment. It builds on the proven quality of the BR and DS Series but adds far greater tuning control, making the ER Series ideal for drivers who want more precise handling balance on fast road cars and track focused builds. Key Features Digressive piston and damping curve External reservoirs with 30