JBA 304 series long tube headers are the number one choice for maximum performance gains and high RPMefficiency. These long tube designs are dyno and race proven to deliver the greatest possible increase inhorsepower and torque throughout the RPM range. All JBA long tube headers feature large mandrel-bent304L stainless steel primary tubes, oversized exhaust ports, extra thick 3/8 one piece flanges, and proprietary JBA Firecone merged collectors for smooth flow. Each system is designed to give the maximum amount of ground clearance possible so lowered cars do not drag the collectors. Each system includeshigh quality hardware and thorough instructions for a professional no-leak installation.*Standard on 4-1 long tube V8 applications. Not available on Tri-Y headers.