Dunno if I already replied to your previous post? My CAT was removed. With the stock pan muffler still in place the real problem is the car is really loud. Especially noticeable INSIDE the car. This is very objectionable on an automatic car, as the "riceboy" effect you might live with when you manually change gear is debateable, but when the trumpeting noise goes up and down in pitch with the wandering engine RPM on an auto, almost everyone who rode in my car objected strongly to it. Adding a rear muffler under the trunk area will largely bring the noise down.

KP