Our dual valve springs are crafted from premium Superclean Chrome Silicon Vanadium Steel alloy, ensuring exceptional durability and high performance. Each spring is meticulously designed to maintain optimal wire stress levels and controlled harmonics, offering superior stability and longevity under extreme conditions. Perfect for high RPM and high-performance applications, Supertech's dual valve springs provide unmatched reliability and efficiency. Upgrade Mini R56 N18 JCW with Supertech's precision-engineered dual valve springs for peak performance and uncompromised reliability. .