I gave up running open headers years ago! Lol! 2 1/4 going to 20 year old turbo muffs ( hmm) with 2" or less out the back. Bought 2.5 " pipe and Flowmaster 40s last year. Wanna go from them to 2.25" out the back.... not my post, just trying to learn. I'm in Full Belief though, that without help from the Brothers here, I would have popped something.. . Ugh.
