Hypercoils 13" Rear Coil Spring - 5" O.D. - 200 lb. 37017K 105" wall chromemoly steel then

105" wall chromemoly steel then black oxide coated and heat-treated

This bolt on 409S stainless steel system features a 3

This installation kit will fit #RJS50523 series Window Nets

Low RPM correct Low RPM with throttle body upside-down LT car intake blade orientation shown above

Hypercoils 13" Rear Coil Spring - 5" O.D. - 200 lb. 37017K 105" wall chromemoly steel thenHypercoils are manufactured from the highest quality chrome silicone steel and high tensile chrome silicone steel available in the world. The material used in producing Hypercoils undergoes two separate magnaflux inspections. Once before manufacture and again after coiling. These inspections insure the wire is free from surface imperfections which, if gone undetected could lead to spring failure. The life of a suspension coil is directly related to