150 lbs./in. Spring Rate 10" Tall Coil Over Shock Springs - Black (Pair) Step up to the high-rpm

Step up to the high-rpm power of an open plenum with Speedmaster HiRise intake manifolds

these pickups help keep your motor bathed with a healthy supply of oil

Speedmaster harmonic balancers are crafted from high-quality steel and feature a tuned elastomer for optimal engine performance

Solenoid and RPM switch sold separately

150 lbs./in. Spring Rate 10" Tall Coil Over Shock Springs - Black (Pair) Step up to the high-rpmSpeedmaster coil springs are designed to withstand the high stress levels of modern suspensions. They're manufactured from high quality chrome silicone steel, heat treated and shot peened, and then powdercoated or plated for protection and appearance.