QA1 GS401-10650A GM Pro-Coil Single-Adjustable Aluminum Coilover Kit 10-650 Tapered Pigtail

The QA1 GS401-10650A Pro-Coil Single-Adjustable Coilover System is a complete front coilover conversion kit designed for GM vehicles. This bolt-in system replaces the factory front spring and shock setup with a fully integrated coilover assembly that delivers improved handling, ride quality, and ride height adjustability without cutting or modifying the stock mounting locations.

Each kit features QA1's single-adjustable shock absorbers, which allow tuning of rebound damping to match driving style and road conditions. The shocks are paired with specially designed 10-650 rate tapered pigtail springs — a 10-inch length with a 650 lb/in spring rate — seated in a billet aluminum spring perch for reduced unsprung weight and a clean, race-inspired appearance.

Key Features:

• Single-adjustable shock absorbers for precise rebound damping tuning
• Billet aluminum construction for lightweight durability
• 10-inch, 650 lb/in tapered pigtail coilover springs
• Stock mount, drop-in front coilover conversion — no cutting required
• Ride height adjustable via threaded spring perch
• Includes all required mounting hardware
• Kit includes (2) QA1 single-adjustable shocks and (2) matched coilover springs

The QA1 Pro-Coil system is an ideal upgrade for performance street driving, autocross, and road course applications where tunable suspension geometry and consistent damping control are essential. All components are manufactured to QA1's exacting tolerances for long-term reliability and repeatable performance.