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What you could do if you're going with the 2.5" pipe and want it a little quieter is get 1 or 2 2.5" resonators or glasspacks and have the muffler shop weld them into the piping before the muffler. they're straight thru so they wont cause any more backpressure, they'll just quiet the tone and interior noise down a little. as for the muffler, you could get the single muffler like the flowmaster 80 and run dual tips out the back, or you could split the piping over the axle with a Y-pipe and run pipes to dual mufflers which you'll see under the bumper.
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