I'm looking into upgrading my exhaust to the Invidia Q300 Catback TI-Tip. I just got off the phone with my parts guy (trying to find out whether or not it will effect my warranty) and he said in theory, no. So long as I only change the exhaust itself and not the downpipe or midpipe. So my question for you all is do you think it is worth it to change out just the exhaust? Any power gains or will this basically be like putting a playing card into your child hood bicycle spokes?