AST 2003-04/2009 BMW Z4 Lowering Springs - 30mm/30mm 1994-gmc-k1500-suburban-sle-esi4180233 The valves direct the flow

The valves direct the flow of exhaust gases and open passageways to bypass the muffler in performance mode

Cables will increase starter performance by reducing voltage losses from undersized cables

GM4-HDR6 kit features ACT's most popular Heavy Duty pressure plate

Measured Flow: 670 CFM @ 7" H2O

AST 2003-04/2009 BMW Z4 Lowering Springs - 30mm/30mm 1994-gmc-k1500-suburban-sle-esi4180233 The valves direct the flowThe AST Lowering Springs reduce your cars center of gravity while maintaining the comfort of OEM springs. Designed as a direct OEM replacement, they are vehicle specific and crafted with premium materials on top quality Wafios coiling machines. Their progressive design balances a lowered stance with enhanced performance. With compatibility across over 3,000 models from 1966 upwards, these springs suit a wide range of vehicles. Backed by a lifetime