QA1 GS501-11300A Front Pro Coil Single Adjustable Coilover Kit GM 11in 300lb/in Tapered Pigtail

The QA1 GS501-11300A is a front Pro Coil single adjustable coilover shock kit engineered for GM muscle cars and classic vehicles. Built with a lightweight billet aluminum shock body, this bolt-in system delivers a significant upgrade over factory suspension in both ride quality and performance tuning capability.

The kit features a fully threaded shock body providing up to 2 inches of ride height adjustability, letting you fine-tune stance and weight balance without specialized tools. The included 18-position simultaneous compression and rebound adjustment knob is accessible by turning the steering wheel to full lock, making on-the-fly tuning straightforward. Adjustment ranges from a smooth, comfortable cruise to a firm, performance-oriented feel.

Included is an 11-inch high-travel spring rated at 300 lb/in with a tapered pigtail end for stock-style mounting. These American-made springs feature fewer coils and a reduced wire diameter compared to standard coils, resulting in greater suspension travel and faster response. The shock has a compressed length of 10.13 inches and an extended length of 17 inches. The kit is compatible with both OE stamped steel control arms and QA1 tubular control arms.

Key Features:

• Lightweight billet aluminum single adjustable coilover shock body
• 18-position simultaneous compression and rebound adjustment
• Up to 2 inches of ride height adjustability via threaded shock body
• Includes 11-inch, 300 lb/in high-travel spring with tapered pigtail end
• Compressed length: 10.13 inches | Extended length: 17 inches
• Bolt-in installation compatible with OE and QA1 tubular control arms
• 100% dyno tested and serialized
• Serviceable and rebuildable by QA1 authorized service centers
• Limited Lifetime Warranty
• Made in the USA

Sold as a pair, the QA1 GS501-11300A Pro Coil kit is an ideal suspension upgrade for street performance, autocross, road racing, and street rod applications. QA1 shocks are proudly manufactured in Lakeville, Minnesota.