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hmm, i really wouldnt worry about a header for nitrous, more like making sure your dont blow the welds on the intake. :wink:

I havent seen any header benchmarks, id think that 4-2-1 has smoother flow if its a one, peice, but they are usually 2. Someone a header expert in here?
 

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4-1 for nitrous :)
 

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I'm going to say 4-1 since your using more top end, and I don't think its good engaging nitrous at under 3500 rpm anyways.
 
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