These Mopar Performance valve springs are made from stronger steel than OEM and are intended for general performance use. Theyre available for many applications in single and dual versions. High-pressure Valve Springs can be used on exhaust and intake valves for all high-performance applications. They feature a shorter fully-compressed height and allow for increased valve lift. Springs maintain spring load at higher rpms...a must for high-performance cams. Sold individually. With a single spring, the damper is installed inside the main spring; with a dual spring, the damper is installed between the inner and outer springs. There are no dampers in the triple springs.