Originally Posted by sinister04CTT

performance and sound. Removing the secondary cats will make it noticably louder but you will get a nice performance gain as well due to removing the restriction in the exhaust. Turbo cars like as little back flow as possible.... The turbos actually noticibly spool up quicker and the torque curve feels a lot flatter all the way through the rpm band now as well as a noticible gain in hp at higher rpm's