QA1 GD507-09450D Pro-Coil Front Double Adjustable Coilover Kit 450 lb/in Spring

The QA1 GD507-09450D Pro-Coil Front Coilover Kit is a complete double adjustable coilover system built around QA1's lightweight billet aluminum shock body. Designed as a stock-mount, bolt-in upgrade, this kit delivers serious suspension tunability for street performance, autocross, road racing, and drag racing applications.

At the core of the system is the GD507 Pro Series double adjustable shock, which allows independent adjustment of both compression and rebound damping. With 18 clicks of adjustment per knob, each shock offers over 300 possible damping combinations, letting you dial in the suspension precisely for any driving condition.

The kit includes a 9-inch high-travel pigtail-upper spring rated at 450 lb/in. These American-made springs feature fewer coils and a smaller wire diameter compared to standard coil springs, resulting in greater suspension travel and reduced unsprung weight for faster, more responsive handling.

Key Features:

• Double adjustable compression and rebound — independently tunable
• 18-click adjustment per knob — over 300 damping settings per shock
• Lightweight billet aluminum shock body
• Fully threaded body for ride height adjustment
• Compressed length: 9.63" | Extended length: 14.5"
• Includes 9" high-travel pigtail-upper spring — 450 lb/in spring rate
• Large diameter 2.5" coil spring
• Stock mount, bolt-in installation
• 100% dyno tested and serialized
• Rebuildable and serviceable by QA1 authorized centers
• Made in the USA
• Sold as a pair

The fully threaded shock body allows precise ride height adjustment to achieve the ideal stance or fine-tune corner weight balance. Every unit is 100% dyno tested and serialized from the factory, ensuring consistent, reliable performance right out of the box.