H&R 28991-1 Super Sport Lowering Springs Progressive Rate

The H&R 28991-1 Super Sport Springs deliver an aggressive lowering solution engineered for enthusiasts who demand both performance handling and daily drivability. Built upon the proven foundation of the H&R Sport Spring platform, Super Sport Springs take things further with additional drop and a progressive spring rate that adapts to real-world driving conditions.

Every H&R spring is manufactured at H&R's ISO 9001 certified facility in Germany, using a proprietary 54SiCr6 high-alloy spring steel rated at an exceptional 290,000 PSI tensile strength. This advanced material provides unrivaled resilience and resistance to spring sag, ensuring your ride height stays consistent over the life of the spring.

Key Features:

• Lowers ride height approximately 1.75 to 2.3 inches on average for an aggressive performance stance
• Progressive spring rate delivers a compliant everyday ride while stiffening progressively under hard cornering and load
• Reduces center of gravity for improved handling dynamics and cornering stability
• Manufactured from 54SiCr6 spring steel at 290,000 PSI tensile strength for long-lasting performance
• Produced in an ISO 9001 certified engineering and manufacturing facility in Lennestadt, Germany
• Drop-in replacement design — compatible with OEM shocks and struts (sport shocks recommended)
• Provides a superior performance stance without sacrificing ride comfort

H&R Super Sport Springs are the ideal upgrade for the seasoned enthusiast seeking maximum lowering with a street-friendly ride. The progressive winding technology means the spring rate increases as the spring compresses, delivering the best of both worlds — smooth compliance over everyday road imperfections and precise body control when pushing the vehicle hard.