Fair enough. I will add that even though there isn't a tune for the cbe doesn't mean its not a performance part though. Anytime you change any diameter exhaust pipe on a Turbo car its going to change performance on that vehicle whether tuned or not. I do notice my spool up being quicker and the way the Turbo sounds under boost now is ridiculous (in a good way) lol. The difference just isn't enough to require a tune is all. As far as looks I'm sure the 4 inch tips will draw some attention but it is definitely legal and I can fight and win that one.