Kooks 2016-2019 Cadillac CTS-V LT4 6.2L 1-7/8in x 3in SS Longtube Headers w/Green Catted Connection Pipes2016 2019 Cadillac CTS V LT4 6. 2L 1 7 8" x 3" Stainless Steel Long Tube Headers and 3" x 2 3 4"(OEM) GREEN Catted Stainless Steel Connection Pipes. Must Cut Stock Exhaust. No additional parts required. Kooks 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