Quote:
this only applies to the exhause manifold and head, the intake is fine to do it to, as well as the manifold to turbo and turbo to o2 housing.
if you port match to that size on a stockish head with a smaller turbo, the port volume expands right at the gasket, then tapers BACK DOWN to the exhaust manifold size. creating a dead spot. leavie it stockish sized and enjoy the benefits of port velocity into the turbo. basically, lay the gasket onthe manifold and compare the size difference, it is nearly identical already. now go and check out how small evo 8 and 9 exhaust ports are, even on 600+ hp setups
now big hp, big turbo and big head/cams cars are a different story.
If I was gonna port the head to match the same port size as the gasket, i'd want the exhaust manifold ports to match obviously, right? Otherwise yeah I can see there being a pretty big dead spot there. That would basically mean a custom manifold right?
I wouldn't call mine a big hp setup, and I don't think any port matching is necessary for my power goals, I was just worried that the slight 'step' created by the difference in port size between the manifold/head and the gasket would affect flow somewhat. From what everyone has said above though, i'm no longer worried.
On another note, it's all bolted on. Just waiting on my new banjo bolt and washers from Mitsu for my water line, should be here tomorrow
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. Anyone else? (not that I don't trust you 89Mirageman, just keen to hear a couple more opinions 
)
