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I just noticed the link you had there. Wow they have N1 style mufflers for $10 with $20 shipping. You got to love the claims these Ebay product make. Now the N1 I looked at on there did have a 2.5" inlet, so if you wanted to try them out buy them & have a muffler shop fab up the rest of the system with 2.5" piping to a free flow cat or silencer. The 3.5" or 4" exit / tip is not going to be the deciding factor just the inlet sizing.
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