The H&R 96-03 BMW 540i Sport E39 Sport Spring (Non Touring) is a performance-enhancing suspension spring designed to improve the handling and ride quality of BMW 540i Sport E39 models. It is made from high-quality chrome silicon steel and is designed to reduce body roll, increase cornering stability, and improve overall performance. The spring rate is approximately 20% stiffer than the factory spring, providing a more aggressive and sporty feel. The sport spring is designed for non-touring models only and is an ideal choice for those looking to improve the handling of their BMW 540i Sport E39.