The Corsa with Kooks headers together make the jeep sound like something out of Nascar. I would hate to be the person behind me when I open it up. Not to loud in the cabin but it is definitely louder than stock.
The Vette has the same issue, depending how you look at it. Its a very nice sounding exhaust when normal driving, and occasional romps, but when you get on it WOT through 1st and 2nd (Auto :baby. It gets really annoying. Put the top down, and well, you get the picture.