Hypercoils 4" Coil-Over Spring - 2-1/2" I.D. - 600 lb. 30005P Straight-through design ensures unrestricted exhaust

Straight-through design ensures unrestricted exhaust flow and reduces back pressure

Over the years we have built and ran several cars and have an appreciation for the effort and dedication it takes compete

1977-1990 Chevrolet G10

Has externally accessible pressure relief valve (max 14 psi)

Hypercoils 4" Coil-Over Spring - 2-1/2" I.D. - 600 lb. 30005P Straight-through design ensures unrestricted exhaustHypercoils 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