H&R 51857 Street Performance Coil-Over Spring Kit

The H&R 51857 Street Performance Coil-Over is engineered for enthusiasts who demand improved handling and a lowered stance without sacrificing daily drivability. H&R's coil-over system features a mono-tube gas shock construction—a significant advancement over traditional twin-tube shock absorbers—delivering superior heat dissipation, consistent damping response, and a more refined ride.

H&R is widely recognized as the originator of the true street coil-over system and continues to set the benchmark with precision-engineered suspension solutions. Each unit pairs a progressive rate spring—designed from the ground up to complement the shock's specific valving—with a fully threaded shock body that allows for accurate, on-the-fly ride height adjustment. The result is a cohesive suspension system rather than a collection of mismatched components.

Key Features:

• Mono-tube gas shock construction for consistent, fade-resistant damping performance
• Fully threaded shock body allows precise, tool-adjustable vehicle lowering
• Progressive rate springs matched to shock valving for optimized ride and handling balance
• Average lowering range of 1.0 to 2.5 inches for an aggressive stance with improved center of gravity
• Engineered for street use—suitable for daily drivers through serious performance enthusiasts
• Delivers improved cornering stability and steering response while maintaining ride comfort

H&R Street Performance Coil-Overs are a complete, purpose-built suspension upgrade. Whether you're looking for a cleaner stance on a daily driver or a sharper-handling setup for weekend performance driving, the H&R 51857 delivers a refined, well-balanced solution backed by decades of suspension engineering expertise.