Hypercoils 13" Rear Coil Spring - 5" O.D. - 200 lb. 37017K This bolt on 409S stainless

This bolt on 409S stainless steel system features a 3

Proven to handle 500 miles of competition at over 9500 RPM

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

making it ideal for wrapping starter motor or other components that are close to high heat areas

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

Hypercoils 13" Rear Coil Spring - 5" O.D. - 200 lb. 37017K This bolt on 409S stainlessHypercoils 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