Forgot to mention that I have a cutome made exhaust from the cat. back. At the end where the pipe is supposed to split, the guy who made it actually T'd it off instead of Ying it off. The exhaust pipe is now 2.5 inches and where its T'd off it's 3 inches. One, do you think it's creating too much back pressure and clogging the cats? And two, should I switch it back to a Y'd split? And do you think I should replace the cats?
