rear shocks rubber bearings from the Z3 are much stronger and also used in the E36M3 Part Nr.33 52 1 137 972 bigger header from the non catalytic converter spec. it's cheaper and as big as the EVO3 but has no hole for the oxygen sensor, you have to drill a hole in one pipe,don't put it in the crossover,e-mail me for mor details Part Nr.11 62 1 309 348