Originally Posted by WarmAndSCSI

Yeah, no...

The more heat the turbo system is allowed to contain up until the turbine nozzle, the better. Beyond that, you want things to be cool as with anything else. Introducing heat or allowing turbo components to heat soak does nothing for performance.

It's the exhaust charge that you want to remain hot - that is, of a high velocity (in this case the exhaust charge loses energy through lost heat). STS coats their piping inside and out to help with this. Looks like the turbine housing has a blanket on it as well so more insulation there.

The fan is doing nothing there except helping flow some fresh air to the intake.