UMI Performance AB4450-1 Double Adjustable Coilover & Lowering Spring Kit

The UMI Performance AB4450-1 is a complete front and rear coilover and lowering spring kit designed to dramatically improve handling performance while giving your vehicle an aggressive stance. This bolt-in kit requires no welding and no spring compressor, making installation straightforward for experienced home builders and shop technicians alike.

At the heart of this kit are four Viking double adjustable shocks, hand-built in Lakeville, Minnesota. Each shock features 19 independent compression and 19 independent rebound settings, delivering up to 361 unique damping combinations. Tuning is simple — just turn the knob, no tools required — allowing you to switch between street, drag strip, and corner-carving setups on demand.

What's Included:

• (2) Front coilover shocks — double adjustable, Viking
• (2) Rear shocks — double adjustable, Viking
• (2) Front springs — choice of 250, 350, 450, or 550 lb/in spring rate
• (2) Rear springs — choice of 1" or 2" drop (Hotchkis)

Key Features:

• 0–3" front lowering range via the hybrid coilover spring system; easy height adjustment with optional Torrington bearings and wrench
• 1" or 2" rear drop with Hotchkis springs at moderately increased spring rates for improved handling
• Lowered ride height reduces center of gravity and places the upper A-arm in a more favorable geometry angle
• Viking springs are Made in the USA — premium quality, shot-peened, and coated for long-term durability
• Double adjustable shocks with 19 compression and 19 rebound settings (361 total combinations)
• Bolt-in installation — no welding, no spring compressor required

Recommended Baseline Shock Settings:

• All-around street: 6C / 8R front and rear
• All-around corner carving: 10C / 12R front and rear
• Strip (drag): 6C / 2R front, 6C / 6R rear

The UMI Performance AB4450-1 combines a hybrid front coilover system with Hotchkis rear lowering springs and Viking double adjustable shocks into one comprehensive performance package. Whether you're building a Pro-Tour street machine or a weekend track car, this kit delivers the tunability and quality to get the most out of your suspension.