I am here with a friend of mine trying to tell me that a ported/coated exhaust manifold would not benefit me in anyway without porting the head. Hey guys give him the details.

Does anyone have a ported/coated exhaust manifold and some specs to prove to him that it makes some gains on our Evos?

What kind of gains have people seen with a stock ported/coated exhaust manifold

I would like everyone in on this. Hit me up

 

you wouldnt see the true benifits of a ported head until you are running bigger cams on a bigger turbo, so there for your head is not your limiting factor right now, yes you will have small increases by porting your exhaust manifold, probably not to noticable but you will pick up a few ponies, do to the path of the exhaust flow being less restricted, the easier it flows the better hope this helps, you got your cams yet??

 

Haven't recieved yet. They are in Colorados shipping place

 

C'mon people hit this thread up. Let us know something

 

I have a ported exhaust manifold and I am happy with it. I also helped my friend install a ported intake manifold and ported throttle body a few weeks ago and we felt a definite improvement.

 

A ported exhaust mani is good for about 5-10whp at your mod level... and NO you do not need to get your head ported to see the difference..... Your friend needs to do some research... if you upgrade to a bigger turbo and bigger cams then a ported head will help..

 

a stock ported manifold will make 7-10whp... The coating doesnt help....

PM me if youd like a quote for a ported manifold exchange, 0 down time.


Cheers!

 

Now I know that a ported/coated manifold is good and just trying to tell hom the facts.

Now he mentioned something about the ported manifold could cause turbulance between the head and mani because of the size difference. What's up?

 

The turbulence is there now because the head ports are larger than the stock manifold. Enlarging the ports gets rid of that.

 

Your friend is retarded. There is a diameter difference from the factory and it is supposed to be there! The ID of the exhaust manifold should always be larger than the ID of the head exhaust ports.

 

yes getting your stock exhaust mani ported/coated will net you an improvement..not so much in hp / tq but rather in the spooling of your turbo.

 

He said he just doesn't see how a bigger ported manifold would make any difference if the head isn't ported to accomendate it

 

I cannot say individually, but adding a ported manifold, 10.5 hotside, and 02 housing all together definately showed improvements.

 

Looking through that perspective... How does adding a catback add power??? How does adding a turboback add power? It's the exact same principle on a smaller scale.

 

I'm really tryin to beat this into his head because he honestly doesn't believe alot of the facts I'm giving him about our evos.

Running alot of HP on a stock turbo(about 350+), the manifold deal and a few others.