Info about KH turbo motor?

[Michael Gough]

Hello list,
I am not looking to buy one for anything, just currious about the KH specs
and power. The KH has 8.3:1 compression ratio. What boost level does the KH
run? The MC has 7.8:1, runs ~6-7psi and makes 160hp. The KH has 8.3:1 but
only makes 135-140hp with an intercooler. Does it only run like 2 psi of
boost? Why does it only make 5hp more than the 80 5kt (7:1 compression, no
intercooler) with so much more compression and an intercooler? I am just
currious, if someone could shed some light on it I would appriciate it.
Thanks guys,
Mike