UMI Performance A206-450 Double Adjustable Front Coilover Kit

The UMI Performance A206-450 is a complete front coilover kit designed as a direct bolt-on upgrade for 4th Gen F-body vehicles. Built in partnership with Viking Performance, these shocks are individually assembled, dyno-tested, and serialized at Viking's facility in Lakeville, Minnesota — ensuring consistent, documented quality in every unit.

The kit features 19-way independently adjustable compression and rebound damping, delivering 361 possible valving combinations to dial in the perfect setup for drag racing, street driving, autocross, or road course use. Adjustments are made by hand — no tools required for damping changes.

Key Features:

• Includes (2) double-adjustable front coilover shocks
• 19-way adjustable compression and rebound — 361 total valving combinations
• Standard 2-1/2" ID springs in multiple rates to suit your driving style
• Springs are lightweight, high-quality, and Made in the USA
• Direct bolt-on installation — no cutting or fabrication required
• Spanner wrench and thrust bearing kit included for convenient ride height adjustment
• Shocks can be rebuilt at Viking or an authorized Viking rebuild center
• Every shock is built, dyno-tested, and serialized for traceability

Available Front Spring Rates:

• 275 lb/in — Trailered drag car; extreme weight reduction required
• 300 lb/in — General drag race use
• 350 lb/in — General street use
• 550 lb/in — Autocross, road course, and corner carving

Included Hardware:

• (2) Double-adjustable front coilover shocks
• (2) Front coil springs (rate per selection above)
• Spanner wrench tool for ride height adjustment while shock remains mounted
• Thrust bearing kit — placed between the spring and spring seat to allow smooth, easy height adjustments (highly recommended; do not adjust ride height without thrust bearings installed)

Ride height is adjusted via the included spanner wrench and takes only a few minutes per side. The thrust bearing kit allows the spring seat to rotate on a bearing, significantly reducing the effort required for height changes.