FWIW Stratmosphere is a good choice. Had mine after 45K+ miles and still loving it. It sounds like a rally car [ame=http://www.youtube.com/watch?v=g3Mk4oAjFHc&feature=player_embedded]YouTube - Stratmosphere Mk2 Mini Cooper S Catback Exhaust[/ame] They are actually doing a refresh to the Mk2 exhaust system, which should be better - according to the fabricator.
I opted for a Custom Magnaflow exhaust. I am running 2.5" pipe from the first exhaust hanger to my Polished Stainless Steel Magnaflow Muffler. I eliminated the second cat and resonator. I love it. :ihih: It is louder then stock, but in my opion resonable. No CELs. No Drone. Plus it cost me $350.00........ I also noticed my Turbo Spools quicker which makes it noticably quicker. :devil::beer I have also noticed I have become faster, due to hearing the motor much better for my Shifts. :ihih: I too was worried about a Loud Abonoxious Exhaust. I can play my Stereo at Highway Speeds with no interference. This has to be my best mod next to tinting my windows (South Florida Sun!).