Originally Posted by ArSoN9
...but I feel 180whp is alot to loose...
I think you mean't to say torque, not horsepower? If so, that's pretty typical for the smaller .63 a/r turbine - they choke on the right side of the RPM band. Great spool for the street, big lumpy torque hit in midrange, but huge torque fall off up top.
Junior, Phatron, $64K question: what happens when he drops down off the plateau to sea-level, knowing that he's gonna have ~ 3-4" more absolute manifold pressure? Can he just drop boost by 3-4 psi and call it good?