Is anyone else disappointed in the Corsa exhaust? My exhaust makes just about every sound imaginable. Pops, burbles, marbles in a can, etc... These are not the kind of sounds I was looking for in an exhaust for a "luxury" car. I don't really mind the burble, but the backfires and pops between shifts are annoying as hell, and the marbles in the can sound is just plain brutal. My dealer has already replaced a resonator to try to help the situation, but they aren't familiar with the exhaust (mine is the only one they've installed), so they're out of ideas. Is there a place in the Philadelphia, PA/Delaware/Maryland area that installs these systems regularly and can help me out?