Diesel JD
Full Access Member
Sounds like you can use the intercooler with those kind of boost numbers. I'd be scared to break something with 17 psi even with that factory turbo engine. On my 86 6.9 I'd be scared at anything over around 10 but then she is old and has reused head bolts. 15 psi is probably okay on a factory turbo 7.3 but without the IC you aren't gaining much additional power beyond 13 psi.