UMI Performance A225-250R Front Coilover Double Adjustable Lowering Kit with Viking Shocks

The UMI Performance A225-250R is a front coilover adjustable spring lowering kit designed for serious performance applications including drag racing, street driving, autocross, and road racing. At the heart of the kit are two Viking double adjustable coilover shocks, each individually built, dyno tested, and serialized at Viking's facility in Lakeville, Minnesota. The hybrid coil springs are proudly Made in USA and feature a brilliant protective finish engineered to resist corrosion and maintain appearance over years of use.

Key Features:

• 19-way independent compression and rebound damping adjustment — 361 possible tuning combinations to dial in the perfect setup for any application
• Bearing-mounted lower shock attachment — maximizes reliability and performance for corner carving, drag racing, autocross, and road race use
• Front spring rate options: 250, 350, 450, 550, or 650 lb/in to match your specific build and application
• No coil spring compressor required — the height adjuster acts as the compressor for safe, convenient installation
• Compatible with UMI's geometry-corrected upper A-arm or factory lower A-arm
• Shocks are rebuildable at Viking or an authorized Viking rebuild center
• Allows ride height adjustment from factory height up to 3 inches of lowering
• Optional spanner wrench and thrust bearing kit available for easier on-vehicle ride height adjustments (recommended but not required)

Spring Rate Selection Guide:

• 250 lb/in — 11" tall springs for drag race only; serious front-end weight reduction required
• 350 lb/in — Small block cruise or drag race; lightening recommended
• 450 lb/in — Small block cruise or big block drag race applications
• 550 lb/in — Small block handling and all big block applications except drag; supports up to 2" lowering
• 650 lb/in — Small block and big block handling, autocross; supports up to 2" lowering

Mounting Options:

• Polyurethane lower mount — Recommended for mild street use; provides ride comfort and reduced harshness
• Bearing lower mount — Recommended for performance applications including autocross, drag racing, and road racing; increases reliability and precision

The Viking hybrid coil spring design features an upper section sized to seat in the vehicle's factory upper spring perch and a lower section matched to the coilover shock body, ensuring a precise fit without modification. The optional spanner wrench and thrust bearing kit places a bearing between the spring and spring seat, allowing smooth ride height adjustments while the shock remains mounted. Pairs seamlessly with UMI's geometry-corrected upper A-arm loaded with a tall ball joint for a complete front suspension upgrade.