ST 27310061 Coilover Spring Kit AUDI RS4; (QB6) 04/06- FA 15-40 RA 0-25ST 27310061 Height adjustable springs kit (lowering springs) The ST suspensions coil springs convert the OEM suspension into a height adjustable setup while retaining the factory dampers. Thanks to the ST threaded sleeves, the system is compatible with vehicles equipped with either welded or clipped spring perches on the original dampers. On applicable vehicles, the use of electronic damper control can also be retained. The springs are engineered with