not to be critical, but since its an inline, it is header, not headers, because theres only one. if your lookin for power throughout your run, go for a 4-2-1 2 piece header from dc motorports. if your lookin for high end, go for a 4-1 1 piece from them also. dc is pretty much the best bang for your buck for a header. greddy makes some badass stainless ones but are like 400 bux or more
The best headers are going to cost like 1g. Toda's are good headers. But the best bang for your buck hands down is a ITR 4-1 Header. It's not as good as the far more expensive ones..but it's hella close. Plus they run around $300 -$350. That's what I'm saving for. I have a link for all the different kinda of headers dynoed on an ITR but I have to get back to you on it. DC 4-1 makes good headers, almost as good as the ITR and it costs like only $200-$250 for the ceramaic ones, the metal ones I think like $400. The ceramic ones tend to crack after a couple years. If I were you get the ITR 4-1 header, they're metal too.
Also you may want to check into the CTR header. Those may be good, but I haven't seen any dyno on them and I don't know how much they cost.
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