D2 Racing GTseries suspension coilover was developed for ultra high performance street cars that also see double duty as weekend track cars. The D2 GT series coilover suspension features more aggressive spring rates than the D2 RS series coilovers, and comes equipped with external nitrogen reservoirs to allow for independent adjustment and fine tuning of compression and rebound. The D2 GT series coilover is the ultimate street/track coilover system on the market.