I have a custom made rear mount with a ST80 turbo, do you think having 98-99 exhaust manifolds is hurting performance over using 2000-02 manifolds?

 

I was thinking this same question. I would think so, but iam just guessing.Maybe by switch to the beefier cast style we could spool alittle faster?

 

I know, but when you look at how small a T4 flange is it makes you question if it really matters.

 

Just clean up the entry ports into the manifolds with a grinder and they should be fine for what you are trying to do.....

 

anybody else have any input?

 

their fine..... actually better than long tubes or shorties... no need for any work at all.

 

I've heard the 98-99's don't flow well, I didn't know if it mattered on a turbo set up.

 

it is true they don't flow as well as the improved 00-02 manifolds, but for your aplication they will not be a restriction at all. In your application you want maximum exhaust velocity which your factory manifolds will provide. Maybe even better than the 00-02 manifolds..!!!!!

 

It should help if they are wrapped with hi temp fabric. And also wrap rest of hot parts.

 

The rest of the hot parts have header wrap, I haven't done the exhuast manifolds, thinking of maybe ceramic coating them.

 

any other comments? You think it keep me from making 700rwhp with a ST80 turbo?