3" x 2-3/4" SS GREEN Catted X-Pipe. 2015-2020 Shelby GT350. Retains OEM Mufflers 1991-pontiac-firebird-esi6483971 While some options will be

While some options will be digressive at lower speeds

Aluminum alloy main plate and steel alloy bearing holder construction - Tough as a tank

Reduces under hood pressure delta to reduce front end lift and increase net vehicle downforce

Significantly reduces under hood temperatures by extracting heat and allowing fresh cold air to enter the engine bay

Tighten these nuts

3" x 2-3/4" SS GREEN Catted X-Pipe. 2015-2020 Shelby GT350. Retains OEM Mufflers 1991-pontiac-firebird-esi6483971 While some options will beKooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks takes pride in offering the best Headers and complete exhaust systems for your street, race and off road applications. We have won hundreds of championships and set countless records in the NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA and many other racing organizations. Now with three generations of family leadership, we are proud