So I have an Invidia 3" catless DP hooked up to an SPT catback. I'm a little bummed because the exhaust fumes are stanky as hell. I'm debating buying a 3" high flow cat and having it welded into a 3" midpipe with the correct flanges to mate up with my DP and axel back. After that I would be 3" all the way through with a single cat and all the right flanges. Anybody see a problem with this? How much do you think I should pay for the bending/welding on a job like this?