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300ZX TT - Exhaust Manifold Limitations?

Perhaps someone of you with modified 300-engines can help me with my

problem:

 

My engine is heavily rebuilt, larger turbos, intercoolers, injectors, forged pistons, cams etc., and it seems that above 5000 RPM, the engine gets "strangled" and can`t get rid of the exhaust.

 

I need to know what limitations the original exhaust manifolds represent

when it comes to increased BHP. At what level in BHP will I need to modify

to get good exhaust flow from the engine to the turbos?

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