H&R Springs Street Performance Coil Over Kit - 2015-2021 Subaru WRX / STI PDM_downpipes-and-y-pipes The correct heat range depends

The correct heat range depends on modification level and boost pressure -- a colder plug is required for elevated boost or aggressive timing to prevent pre-ignition under high combustion temperatures

If your car has the upgraded SPT/STI short shifter package you will need to purchase the 2

and time attack

then more than likely

Year Make Model Notes 2006-2011 Honda Civic Si K20Z3 sedan/coupe

H&R Springs Street Performance Coil Over Kit - 2015-2021 Subaru WRX / STI PDM_downpipes-and-y-pipes The correct heat range dependsHR Springs Street Perf. Coil Over Kit Subaru WRX STI 2015+ RallySport Direct proudly offers a large catalog of performance suspension products and accessories brought to you by H&R Springs. Here, you are looking at the H&R Street Performance Coilovers. These coilovers have several great features that include monotube gas construction with fine tuned spring rates to improve the handling and ride quality of your vehicle. DETAILS: Height adjustable to 1.