A Coil-Over is a suspension component that integrates a coil spring concentrically around a damper into a single assembly with adjustable spring perches. This allows independent adjustment of ride height, spring rate, and damping, decoupling these tuning variables that are linked in stock suspension designs. Coil-overs are essential for performance suspension tuning. Griggs Racing offers coil-over kits and components for SLA, strut, IRS, and SRA Mustang configurations.