I took mine off a little while ago. It idles a little louder, and has more of a bassier sound in the cabin while idling. At between 2 and 3 thousand RPM the exhaust makes a steady drone in the car. From 3- 4 thousand, when the timing is advanced it has a real nice performance sound in the cabin. Above 4 it sounds like a race car.
From the outside, I don't know, but my friends tell me it is real loud.
