for anybody on this side of the atlantic, (ie. Europe) if you feel like making a trip through Germany or are already in Germany, check this place out. After some research, these guys seem to be the only ones around here that can tune, and they offer the MILLTEK exhaust, which appears to be the most viable bolt on performance upgrade available in full system or cat-back. The place is called SKN tune, and they look like they have their ducks in a row. I'll be diving more into over the next week. Here's the link...
http://www.skn-tuning.de/portal/alias__ ... fault.aspx