Exactly.
It's all about exhaust gas velocity, and a higher exhaust charge temperature is indicative of that. Like I said in my previous post, what is important is how well your pre-turbine-housing piping and turbine housing keep energy (read: heat and velocity) from escaping the exhaust system. With piping that is coated inside and out, and a turbine housing that may or may not be coated with an insulating blanket, there is no harm with a lot of cool air being blown around the turbo. End of story.
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'10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake
'08 Evo X - built motor+trans | BB-X @ 32 psi | CH3OH | self-built+tuned - ??? WHP
'01 Galant V6 - built motor | GT35R | self-built+tuned - 550+ WHP (retired) |