Quote:
Originally Posted by RalliartRsX
There shouldn't be. Its a Sinco custom top mount mani with I think 1.25 primaries. Its a semi equal length twin scroll manifold. Should be fairly uninhibited flow to the turbine.
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No, not the manifold itself.
To me it sounds as if there is something blocking you from making any more power. You said it yourself, it doesn't hold anymore than wastegate pressure. So something seems to be blocking the air coming out of the turbine, the pressure is strong enough to push against your wastegate spring, preventing the turbine from making any more boost.
Could it be that the turbine housing/wheel combination is the "blockage"?
You may want to check out this article:
http://www.stavtech.co.uk/home/exhau...nes-never-good