QA1 MG401-10600B MOD Series GM Front Pro Coil System Double Adjustable 600 lb

The QA1 MG401-10600B MOD Series GM Front Pro Coil System is a high-performance front coilover system engineered for drag racing, pro-touring, autocross, road racing, and street rod applications. Built around QA1's double-adjustable MOD Series shock with low-speed bleed and a remote nitrogen canister, this system delivers an extraordinary level of tunability right out of the box.

At the heart of the system is QA1's patented QuickTune Technology — a dry, modular valve pack design that allows the shocks to be completely re-valved in minutes without removing them from the car, interrupting the oil path, or risking contamination. Medium compression and rebound valve packs are included as standard, with soft and firm packs available separately for further customization.

The double-adjustable design provides fully independent control over compression and rebound characteristics via adjustable low-speed bleed, allowing drivers to fine-tune handling behavior separately from bump compliance. The fully threaded shock body enables precise ride height adjustment for the perfect stance or optimized corner weight balance.

Key Features:

• MOD Series double-adjustable shock with independent compression and rebound adjustment
• Adjustable low-speed bleed for fine-tuned damping control
• Remote nitrogen canister with indexable base eyelet for flexible mounting orientation
• Includes 10" tapered flat spring rated at 600 lb/in
• Compressed height: 8.63" | Extended height: 12.63"
• Lightweight billet aluminum shock body construction
• Fully threaded body for ride height adjustment
• 100% dyno-tested and serialized at the factory
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA
• Sold as a pair

QA1's American-made high-travel springs feature fewer coils and a smaller wire diameter than traditional springs, reducing unsprung weight and allowing faster suspension response — optimizing performance from casual street driving to hardcore racing. The MG401-10600B is backed by QA1's limited warranty against defects in materials and workmanship.