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4-2-1 header makes power all the way through the RPM range - the 4-1 header makes power about 4K all the way to redline...i my self have a 4-1 header on a b16a - it gained a shit load in top end..
 

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4-2-1 headers are supposed to have more low-mid range power. 4-1 headers are supposed to have more high end power, but ive seen alot of dynos, and IMO i think 4-1's are better.
 

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Girl said:
They don't show anything under 3500rpm... That's what sucks...
know what else sucks? that's taken from an engine dyno, kinda funny how the
hp is basicly the same as what the stock claim is, i also like how the stock was left out, maybe
the gains just aren't that impressive when compaired to stock :D
 

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kommon_sense said:
DC Sports has a dyno chart of their 4-2-1 and 4-1 on the same engine. The 4-2-1 did have slightly higher gains in the midrange, but they were pretty small. I would go with a 4-1.


DAMN IT I WAS GONNA POST THAT!!!!!...hehe, ya the mid range on the 4-1 is the better of the 2....thats what im going to be getting...
 

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flyracerx said:
do 4-1's give u some low to mid range too? or is it just purely top end?
sure they will but just check out the dynos and youll see that theres really no big difference between the 421 and the 41 in the low
 
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