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I very much need to upgrade my exhaust i had the flowtech terminator in mind but im not sure how it sounds on the 3100... anybody know?? i need this done asap... also what kind of cat should i go with?  Should i run a 3" pipe from the headers back as the inlet pipe on the terminator is a 3" or should i go with 2.25 and an adapter pipe?

alright i decided im going to go with a catco hi flow cat and run 2.25' piping to my muffler than the adapted pipe, than a 3" exhaust tip exiting right infront my passenger tire

I was just about to suggest the exact same thing!