QA1 MG507-09550D MOD Series Pro-Coil Double Adjustable Coilover Kit with Remote Canister 550 lb/in Spring

The QA1 MG507-09550D MOD Series Pro-Coil Coilover Kit is a double-adjustable front coilover system built for high-performance drag racing, pro-touring, and street/strip applications. Featuring QA1's multi-patent-pending MOD Series technology, this aluminum-bodied coilover kit delivers an exceptional level of tunability through its innovative QuickTune modular valve system and fully independent compression and rebound adjustment.

QuickTune Technology — Re-Valve Without Removing the Shock:

At the heart of this kit is QA1's proprietary QuickTune Technology: dry modular valve packs that swap out using only a hex key or Allen wrench while the shocks remain on the car. This is an industry first — the MOD Series can be completely re-valved without interrupting the oil path or exposing the shock internals to debris or air contamination. Medium compression and rebound valve packs are included as standard; soft and firm valve packs are also available separately.

Double Adjustable with Low-Speed Bleed:

Once the desired valve pack is installed, the double-adjustable design with adjustable low-speed bleed provides fully independent control over compression and rebound damping characteristics. With up to 576 possible valving combinations, this shock system delivers an expansive force curve and unmatched tuning flexibility to match changing track conditions or driving preferences.

Key Features:

• MOD Series double adjustable front coilover kit with remote nitrogen-charged canister
• Lightweight billet aluminum shock body with black anodized finish — 3.00 in. body diameter
• QuickTune Technology for tool-free re-valving while shocks remain on the vehicle
• 24-click independent compression and rebound adjustment with low-speed bleed control
• Up to 576 total valving combinations
• Compressed height: 9.63 in. | Extended height: 14.50 in.
• Ride height adjustable 0–2.0 in. lowered via fully threaded shock body — 3.00 in. threaded adjustment range
• Includes 9 in. large-diameter tapered pigtail spring (part: 9HTSP550) rated at 550 lb/in.
• Upper and lower eyelet mounts with spherical bearings | Indexable base eyelet for flexible shock and canister placement
• Remote nitrogen-charged canister for ease of installation in tight spaces
• Includes Torrington thrust bearings and all necessary hardware
• Twin-tube internal design | Gas-charged | No welding required
• 100% dyno-tested and serialized at the factory
• Serviceable and rebuildable by QA1 Authorized Service Centers
• Made in the USA

The American-made high-travel springs are engineered with fewer coils and a smaller wire diameter than conventional springs of the same rate, providing increased usable travel, reduced unsprung weight, and faster suspension response. The kit is ideal for drag racing, street performance, autocross, road racing, and street rod builds.