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4d (04/2003-04/2007) are precision-built in-house
the Stage 2 offered notably better gains compared to the Stage 1 thanks to its much bigger core
2 S Diesel – 2014 – 2020
8 Import (1979-1985) are precision-built in-house
9 Di-D Rear Discs (2002-) are precision-built in-house
BC RACING COILOVERS ER SERIES - BMW 1 SERIES F20 M140I (14-16) (5-BOLT TOP MOUNT) Spring Rates:RECOMMENDED KIT 5.5/9 KG.MM 4d (04/2003-04/2007) are precision-built in-houseThe 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