QA1 DD501-1101 Pro-Rear Double Adjustable Coilover Conversion Kit 3.25" Proma Star 12-110

The QA1 DD501-1101 is a bolt-in rear coilover conversion kit designed to replace your factory rear suspension with a fully adjustable coilover setup. Built around QA1's proven Proma Star double adjustable shock absorbers, this kit delivers independent control over both compression and rebound damping, allowing precise tuning for street performance, road racing, or track day use.

The kit features a 3.25-inch diameter coilover spring configuration rated at 12-110 (spring rate designation), providing a firm yet tunable ride quality. All components are engineered to work as a complete system, eliminating the guesswork of mixing and matching suspension parts.

Kit Includes:

• (2) Double adjustable Proma Star shock absorbers
• (2) Coilover springs (3.25" diameter)
• Mounting brackets
• All necessary hardware for installation

Key Features:

• Double adjustable damping — independent compression and rebound adjustment for maximum tunability
• Bolt-in design — no cutting or welding required for installation
• Proma Star shock body — QA1's high-performance aluminum shock construction for reduced unsprung weight
• Ride height adjustable via threaded shock body
• Designed for performance street and track applications
• Made in the USA by QA1 Precision Products

QA1's rear coilover conversion kits are a popular upgrade for enthusiasts looking to dramatically improve handling, reduce body roll, and gain full control over suspension geometry and ride height without custom fabrication.