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As long as you have smaller pipe (under 2 1/2) then youll have enough backpressure.

As for mufflers, I prefer glasspacks! Theyre loud and cheap!
 

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Virtually all cars have backpressure. Too much backpressure is bad, but some backpressure is good because it controls "over scavenging" which wastes fuel and hurts performance.

In my experience an X pipe seems to quiet the sound a little and helps performance
 

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i have big quiet mufflers on mine got tired of the drone. you can still hear it but is not loud and as fast as i drive didnt need the extra attension
 
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