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i replaced my stock exhaust with dc headers, catback, and a dual greddy 4 1/2 inch exhaust, and im gettin alot of back preasure. how can i change that?
 

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TuscaniGT6 said:
i replaced my stock exhaust with dc headers, catback, and a dual greddy 4 1/2 inch exhaust, and im gettin alot of back preasure. how can i change that?
that really made no sense, no offense but you really need to work on your terminology. OK so if i'm reading this right you have dc sports headers and a GReddy catback? 4.5 inches=your tips, the actual piping diameter of your exhaust is about 2.5 inches or close to it...

To address your next issue, you should be getting far less backpressure. Please explain to me what you mean by "backpressure" as that is actually the pressure of the air pushing back on the engine due to a restrictive exhaust...
 

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With that setup... You don't have very much back pressure to deal with.

The answer to your question ... is install a highflow cat and get a tune.
 
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