How much loss for rear mount turbo?

Excellent video of a rear-mounted turbo. He gets into the boost pretty good at 1 minute.
Museum car that had not been raced for a while so it was limited to 6k and 16#s of boost.

962C porsche single (large) turbo running thru dual intercoolers at front of engine compartment.
It does have a bit of lag. Mostly due to the size of the turbo. This is mid 80s technology.
And yes, it will make you wet your pants.

962-051.jpg

[ame="http://www.youtube.com/watch?v=h842NVgJC_s"]YouTube - Road Atlanta Porsche 962[/ame]