What size are the primaries on aftermarket headers
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What size are the primaries on aftermarket headers
DC Sports, Borla, Stillen? Anyone know what size are the primaries? 1"? I'm thinking since the collectors on either is not bigger than 2.25" the primaries cant be bigger than 1" 1.25"?
Anyone have some aftermarket header that can measure the outside diamerter of the primaries??
Anyone have some aftermarket header that can measure the outside diamerter of the primaries??
Last edited by Andrei; Jan 11, 2011 at 02:34 AM.
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From: Planet Kolob
For anyone interested I did some searching and the primaries of a 1996-Present VQ30 VQ35 VQ37 or VQ40 can be 1.63" 1.75" and 1.88". Aftermarket headers seem to have 1.75" primaries (because it's a standard size and readily available) AND there are 304 stainless steel 16gauge collectors available with 1.75" primaries with a 3" throat. 
EVEN 3.5" is possible 
Turbo flanges can be welded instead of normal exhaust flange.
I also learned that the SFR tubular manifolds are actually NOT overpriced by any means and Fast Intentions longtube headers with 2.5" collectors are actually a good price at $900 considering the cost of materials alone.
EVEN 3.5" is possible Turbo flanges can be welded instead of normal exhaust flange.I also learned that the SFR tubular manifolds are actually NOT overpriced by any means and Fast Intentions longtube headers with 2.5" collectors are actually a good price at $900 considering the cost of materials alone.
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