The Kooks 1-7/8" x 3" stainless steel long-tube headers for 2004–2007 Cadillac CTS-V include 3" x 2-1/2" OEM stainless catted connection pipes that connect to the factory resonator. These headers are built to improve exhaust flow and require cutting the factory exhaust for installation. Standard race cats supplied are not intended for forced-induction applications; Kooks parts are handcrafted in the USA and backed by a limited lifetime warranty.
Kooks 04-07 Cadillac CTS-V 1 7/8in x 3in SS Longtube Headers and OEM SS Catted Connection Pipes