>For street and street-prepared autocross use, which headder is better: 6-1
>or 3-2? Which headder is better for low-to-mid rpm?
>I thank the experts in advance. Good debate!
I'm no expert (thought I'd get that over with up front).
I don't think you can make a blanket statement about either being
"better."
As a common rule of thumb, a tri-y design gives a little less peak
performance, but a wider powerband. And, generally, is tuned to a lower
rpm range. But that's the end of it as far as generallities go I
think. For a tri-y that ended at the firewall would be a higher rpm
header then a 6-1 that ended out behind the gearbox.
Appearances can tell you a whole lot about how it's built and how it
will flow. Tuning lengths are great, but if their mangled on assembly,
it's no good. To my thinking, the more a header reminds you of a
trumpet (smooth flowing lines, sweet looking diameter changes) the
better it is. The more it looks like something a plumber would install
under the sink, the worse it is, and the worse it will flow.
As for autocross, I've been seeing more and more tri-y headers out
there. But don't take that as some sort of absolute endorsement of
tri-y headers for you.
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