Some old posts show that the DC headers arent putting the HP that were said they were, but with nothing but the headers, yeah you can see 10, but for some reason if you already have an exhaust and Intake, dont look at more then 5 with the headres and pulleys!
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What I mean by porting is port the entire inside not just the flanges. But make sure the shop doesn't port it to the point where there is barely any structural integrity of the header. Just enough to gain power, not too much to have holes between the tubes.
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