where to buy exhaust?

Got a flat tire while returning the exhaust kit to jegs. BMW in their infinite wisdom do not provide a spare or jack in their cars and assumes everyone uses run-flats. It was only 2.5mi walk to my house, but of course this happens when I have both my other cars in shops.

Anyway, total for the custom pipes was $320, which I can't complain about that. My only disappointment has been in the mufflers. The ultra flows sound nice and throaty at idle, but once you get up into 2nd gear the drone is horrible. I think it's actually worse than the nameless mufflers that were already on it.