Feel free to flame if this has been made before, but I couldn't really find the answer I'm looking for.
Which would provide better performance and/or sound out of a 3inch 100cell high flow cat or a 2.5inch decat?
I can get my hands on a stock R33 GTS-T cat for free, which I believe is 2.5 inches and turn it into a decat, or I could spend some money on a 3 inch 100cell high flow cat.
Which would you prefer?
Almost forgot to mention I have a 3inch dump/down pipe and 3inch cat back, but a stock cat.