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Old 12-09-2012, 07:56 PM   #7
02ztsian
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Join Date: Oct 2004
Fan#: 14466
Location: Calgary, Alberta, Canada
What I Drive: V6Mistake, Volvo S70

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If you go with the 4-2-1 header make sure that it pairs 1 with 4 and 2 with 3 like this one...

to properly scavenge the exhaust pulses.
I can't remember where I read this but the 4-1 design is supposed to be a high rpm header.
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