When To Replace R34 Gt-T Exhaust Manifold?

[Muffins 34]

So I'm planning my mods for my GT-T before I get it tuned. A new exhaust manifold is pretty costly so I was wondering at which power level the stock one becomes restrictive? I'm aiming for 300-350kW

Cheers.

[Ben C34]

This has been basically done to death.

Stock is fine at that power.

[Muffins 34]

Sorry i couldn't find anything on it. I got referred to this article: http://www.tercelreference.com/tercel_info/turbo_exhaust_theory/turbo_exhaust_theory.html

Which I suggest anyone with the same question should read.

[scotty nm35]

I have seen 400+kw on a few builds using stock manifolds, as long as you use e85 and possibly externally gate the turbo housing you will be fine.

Get in the forced induction section and read as many threads as you can, there is more information in there than any other website or tech paper I have ever read, and it's all related to your particular engine, which makes it invaluable.