You only gasket match your manifold to head connection so the smaller diameter exhaust will reduce reversion?
This is a discussion on P&Ped OEM exhaust manifolds,sensors VA within the Personal For Sale & Wanted forums, part of the ClubWRX.net Marketplace category; You only gasket match your manifold to head connection so the smaller diameter exhaust will reduce reversion?...
No. By gasket matching the exhaust manifold it creates a bigger inlet than the head exhaust port outlet. So when back pressure is high it keeps exhaust gas from going back into the ports by creating resistance due to the size difference. If you remove the exhaust manifold and look at the carbon outline left when you remove the gaskets you will see how big the gasket holes are compared to the actual inlet and outlets. You can see the size difference between the gasket and head exhaust ports. I don't open the whole exhaust runner this size,just the inlet to create the step. I still want to keep velocity up.
Last edited by Donkey; 08-24-2011 at 08:02 AM.
Last edited by Donkey; 08-24-2011 at 12:24 PM.
very interested in 06 07 headers! Comes with x pipe? PNP'd as well? Thanks!
Hawk Eye #1991
Dirty Crew #11
Military Militia #1991
I still don't know how I got this car...
Any more pics of the axleback? Shipping to 97132?
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