Not necessarily true. Internal and external will do relatively the same job in low boost, but in high boost more accurate boost control becomes critcal for the engine's survival, so an external or dual external wastegates are used.

 

Some applications will run into the 40+ psi range.

 

I understand that some people actually run that amount of boost. But if I get a boost gauge that goes to 25 or 30 psi your barely going to see the stupid thing move. It would just be a lot more fun to see the boost gauge fly up and down to near max on the gauge. But i guess i just have to suffer!

 

do you really think the engine gets above 1200° F?

I mean I know high compression exhausts can be hot, but I'd be surprised if the engine itself would reach levels of melting?

 

The motor should not be pushing 1200 degrees.