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If i had a 2002 Civic LX, and if i were to get a k20, would i have to rreplace the my aftermarket muffler and custom 2.25 piping already in my car? what about a AEM CAI?

 
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you dont have to get rid of the exhaust stuff, the intake has to go

 
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What about a turbo? Will I have to get replace or modify my custom exhaust?

 
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no...i dont think so.

 
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well the downpipes are different cause the k20 is transversed so your downpipe becomes significantly shorter, i would think you would have to make a change of the piping before the cat, thats just what i think, i dont have a swap...but it just sounds logical to me

 
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yea...that makes sence.