Thread: 99 GTP runs fine cold, seems to lose a cylinder when up to temp?

Originally Posted by 98GTPCALGARY

Cat-less 3" dp = WIN

5 YEARS??????

I'd love to go cat-less but here in Ontario we have to get emission tested every other year to get plate tags, what is the OEM diameter? 2 inch? If I go 3" I'm guessing I'd have to replace everything from the cat back?