Corsa 22-25 Cadillac CT4 V Blackwing 3in Active Valve Cat-Back - 4.5in Black TipCorsa's Cadillac CT4 V Blackwing cat back exhaust will give your Blackwing the sound it deserves! The system integrates flawlessly with the stock Cadillac Active Exhaust valve assembly giving the driver full control over the driving experience. Simply choose the driving mode you prefer and Corsa's exhaust system responds by quieting down or unleashing the exhaust system. Featuring Corsa's No Drone RSC(R) Technology this system has been custom tuned