3" x 2-3/4" SS GREEN Catted X-Pipe. 2015-2020 Shelby GT350. Retains OEM Mufflers 1991-pontiac-firebird-esi6483971 Installs easily with simple hand

Installs easily with simple hand tools in 2-3 hours

Tighten these nuts

While some options will be digressive at lower speeds

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

3" x 2-3/4" SS GREEN Catted X-Pipe. 2015-2020 Shelby GT350. Retains OEM Mufflers 1991-pontiac-firebird-esi6483971 Installs easily with simple handKooks 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