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					Originally Posted by phoenix7    Makes  sense, what exhaust manifold does the MM turbo use? | 
	
 Its the GReddy cast iron manifold.
Pretty decent piece - the flow cross-section is about equal to the port area.
I've been thinking about an Extrude-Hone to increase flow a bit.
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					Originally Posted by Low Impedance  i think the problem is the turbos are getting out of their efficiency range when you start getting up there. | 
	
 Exactly.
Even though the pressure is rising, the mass is holding because the heat is going up.