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i know that too much or too little back preassureis no good. i heard that you only need to go up in muffler size about 1/4-1/2 inch for n/a cars before you start to lose to much..right now i have one of those autozone mufflers..it's 2.5 but i'm looking to get something else but i'm not sure what size..was thinking about dual tips but noticed that only gt's got them factory..i would assume they move alot of exhaust so would that be over kill on my lx?
 

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No in fact if you could, get one of those twin mufflers. Ones the size of motorcycle mufflers, Apex makes one that looks like their N1 series but smaller. Your n/a 6 should benifit with one of these. You might want to try a muffler off a GT. When I replaced mine it did not look turbo friendly, that thing reminded me of an rv muffler. I have an Apex N1 turbo muffler, but my car is turbo.
 
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