UMI Performance 4057 Bolt-In Rear Coilover Adjustable Lowering Kit

The UMI Performance 4057 is a complete bolt-in rear coilover kit engineered for GM vehicles, offering comprehensive suspension adjustability for drag racing, autocross, and road racing applications. This kit delivers full control over ride height, spring rate, and damping characteristics while allowing precise instant center tuning through trailing arm adjustment.

Key Features:

• True 2.5-inch racing coilover shocks with double-shear mounting for maximum strength and reliability
• Reinforced upper mount designed for direct bolt-in installation (requires drilling one additional hole)
• FEA-engineered lower brackets bolt directly over stock rear control arm mounts utilizing existing shock mounting holes
• 2-position trailing arm height adjustment enables fine-tuning of instant center for optimized launch characteristics or rear steer control
• Fully adjustable ride height, spring rates, and damping settings for custom suspension tuning
• 100% designed, manufactured, and race-tested in Philipsburg, Pennsylvania using US materials

Important Compatibility Notes:

• Direct bolt-on application for stock GM axle housings with factory GM brackets only
• Not compatible with aftermarket axle housings due to variations in design and bracket layout
• Rear shocks may require clearance verification with certain exhaust tailpipe configurations
• Some factory configurations may require drilling an additional mounting hole in the lower bracket location

This professional-grade coilover system provides racers and performance enthusiasts with the adjustability needed to dial in their suspension for optimal performance across various motorsports disciplines.