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Discussion Starter · #1 ·
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?
 

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Discussion Starter · #4 ·
oh lol I must of over looked the 3" in / 2.5" out. Perfect, that solves everything.
 
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