im on a stock (very healthy) engine

std air box,
std turbo,
front mount cooler,
piper exhaust
collins chip
water/meth injection
18psi

and it made 186bhp at last dyno

so anything up to 200 aint gonna be mega money after that its steel bottom end and management if u want more about 5/10k for 300 bhp cos you'll want a mental box to take it all