jeff28

Is it worth the cash to use with a big turbo upgrade or should I just adapt the stock manifold(ported & polished) to the new turbo that I will be using. I am going to go with a IHI VF22 turbo. It is one that a friend of mine sells to WRX guys, and I can get it for a great price.

xr4tic

It's not worth the hassle to port/polish it, then try and adapt the new turbo to it.

I really like the ATP manifold, it's a hefty piece, so you won't have to worry about walls cracking, etc, and it's a straight shot from the cylinders to the turbo.
The only thing I don't like, is the fact that the flange isn't cut like the other manifolds (stock, APR, PES, etc) I plan on cutting mine, since there's not a lot of risk involved.

Does the IHI VF22 turbo have the same inlet as the Garret turbos?
You wouldn't happen to have a compressor map for that turbo, I'd like to see it if you do.