H&R 29177-2 Street Performance Coilover Kit Height Adjustable Mono-Tube

The H&R 29177-2 Street Performance Coilover Kit delivers the ideal balance of everyday drivability and spirited handling performance. Engineered and hand-assembled in Germany to rigid ISO 9001 and German TÜV standards, this complete coilover system replaces your factory suspension with a height-adjustable, performance-tuned solution.

Unlike traditional twin-tube shock absorbers, H&R Street Performance Coilovers use a mono-tube gas shock design built on a fully threaded steel shock body. This construction minimizes unsprung weight, promotes superior heat dissipation, and delivers consistent, stable damping characteristics in all driving conditions. Each shock is custom-valved to work in precise harmony with its matched progressive-rate spring — creating a cohesive suspension system rather than a collection of individual parts.

H&R springs are manufactured from shot-peened 54SiCr6 spring steel for exceptional strength and fatigue resistance. The progressive spring rate keeps the ride compliant over everyday road imperfections, while firming up predictably under hard cornering and braking to reduce body roll and sharpen response.

Key Features:

• Fully threaded mono-tube shock body for adjustable vehicle lowering of 1.0 to 2.5 inches on average
• Mono-tube gas shock construction for consistent damping and reduced unsprung weight
• Progressive-rate H&R springs crafted from shot-peened 54SiCr6 spring steel
• Each shock custom-valved to match its paired spring for a tuned, cohesive system
• Hand-assembled in Germany to ISO 9001 and TÜV standards
• Zinc-phosphate coated shock tubes for corrosion protection and lasting finish
• Lowering reduces center of gravity to minimize body roll and improve handling balance
• Covered by H&R's 2-year warranty to the original purchaser

Professional installation and a full suspension alignment are recommended after fitting. Lowering range may vary depending on factory suspension options and vehicle configuration. Always refer to the included H&R tech sheet for the specified allowable adjustment range.