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I'll try to find the flow data on the stock headers vs. the aftermarket ones from Stillen (which are the same concept as any). I was surprised at how well the stock ones flow. Some very informed and intelligent Z people (some being engineers at Nissan who tested both) have told me time and time again it's negligible and in the two cars I rode in before and after I can't say I disagree. And one of them dynoed and it was minimal (+6hp). BUT...if it feels faster to you...or sounds better...or just makes it that much nicer, awesome. I am NOT raining on a parade here. I'm just saying don't go making it seem that all the NAs should go buy headers. It'd be an injustice. I went through that with gutted cats...thought it was the best thing since sliced bread and had everyone going to do the same thing. Then I realized my folly and that is was a marginal gain and had some pissed people =)
Vote on my Z on www.cardomain.com! Zheaven.com Latest update includes full writeup on the Private Nissan/Toyota Museum Tour 09/08/01 -- Click my Z below to enter. 
It's almost mine...Linux, baby! 
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