In the front the S1 coilover for the MK4 VW/Audi Group platform features 400 lb/inch springrate matched to a twin tube low pressure gas damper mounted in a heavy gold zinc platedthreaded coilover housing that provides not only great handling, but also exceptionalcorrosion resistance. The rear features a progressive coil spring and adjustable threadedperch system with a specially tuned sport damper that ismatched to the lowering range of the coil/perch combination.