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Open the exhaust up with a 2.5 offroad mid pipe with some good flowing mufflers.
 

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Not sure with the while cat/axle backs but if you open it up with a o/r x then it'll breath good. If you can afford it, long tubes are a great mod too.
 

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Axle backs will yield no gains, but when they're a freer flowing muffler, they will pinch out a few negligible HP up top. The X pipe will net you a gain across the entire powerband :) Also it will change the sound
 
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