BC Racing ZR Series Coilovers – Subaru Impreza WRX GC6 / GC8BC Racing ZR Series Coilovers Subaru Impreza WRX GC6 GC8 Sedan All Wheel Drive (19932001)Spring Rates: 10 kg mm Front 8 kg mm RearCoilover Type: ZR BC Racing ZR Series coilovers for the Subaru Impreza WRX GC6 GC8 (19932001) represent the most advanced suspension solution in BC Racings lineup, developed specifically for serious track use and competition oriented builds. Positioned above both BR and ZX Series, the ZR Series features high spec internal