The Detroit Speed, Inc. stainless steel side pipe headers are designed and engineered for LS engines installed in a 1963-1974 C2/C3 Corvette using the Detroit Speed SpeedRay™ front suspension. These headers are designed for performance, maximum ground clearance, and a clean engine compartment appearance. The Detroit Speed Stainless Steel LS headers are durable and attractive with no fitment issues for easy installation. Our Stainless Steel LS Headers use a 1-7/8" primary tube diameter with 4-way merge collectors.All stainless steel headers are exclusively manufactured by Pro Fabrication for Detroit Speed, Inc. suspension applications. These headers are made with high quality material here in the USA.