QA1 MG401-10500A MOD Series Pro-Coil Double Adjustable Coilover Shock Kit with Remote Canister, 500 lb/in Spring

The QA1 MG401-10500A is a MOD Series double-adjustable Pro-Coil front coilover shock kit featuring a remote nitrogen canister and a 10-inch tapered pigtail spring rated at 500 lb/in. Engineered for high-performance street, drag racing, pro-touring, and road course applications, this kit delivers an unprecedented level of suspension tunability from a direct bolt-in package designed to work with stock control arms and stock suspension mounting.

QuickTune MOD Series Technology:

• Re-valve in minutes on the car — QA1's multi-patent-pending QuickTune Technology uses dry modular valve packs that swap out without interrupting the oil path or exposing the shock to debris and air contamination
• Double adjustable with low-speed bleed — fully independent compression and rebound adjustment delivers an expansive force curve capability for precise tuning across any driving condition
• Medium compression and rebound valve packs included as standard; soft and firm packs also available separately
• Remote nitrogen canister — designed for ease of installation in tight areas; indexable base eyelet allows repositioning for optimal shock and canister placement

Spring & Shock Specifications:

• Spring: 10 in. tapered pigtail, 500 lb/in spring rate
• Compressed height: 8.63 in.
• Extended height: 12.63 in.
• Total travel: 4.00 in.
• Torrington bearings included

Construction & Quality:

• Lightweight billet aluminum threaded shock body for ride height adjustability
• American-made high-travel springs with fewer coils and smaller wire diameter for increased travel and reduced unsprung weight
• 100% dyno-tested and serialized
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA
• Sold as a pair

The fully threaded shock body allows precise ride height adjustment for the ideal stance or to fine-tune front-to-rear weight balance. The 500 lb/in spring rate is suited for front axle weights in the 2,001–2,100 lb range and has been validated across drag racing, street performance, autocross, road racing, and street rod builds.