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Right now I'm running a flowmaster y-pipe into a 3" in/out borla xr1 muffler. I'm going to purchase a borla proxs muffler which comes in a si/do but the in/out is 2.5".
So should I buy a new y-pipe collector to fit exactly or would going from my 3" y-pipe to the 2.5" inlets make any difference?
So should I buy a new y-pipe collector to fit exactly or would going from my 3" y-pipe to the 2.5" inlets make any difference?