Expiremental OM617 build
Expiremental OM617 build
I also have a new he200wg 5cm if you decide to go that route. $450 would take it. Custom exhaust vband plate. It should spool very quickly. The hot side might be a bit small for your power goal, but you could run it more sequential with an external gate and get great low end spool in a compound setup.
I doubt that increasing the rpm limit is going to result in much more power. The bsfc goes down so fast at higher rpm on this motor that it is probably a wash.
I think 150cc is going to be very smoky without about 65psi of boost.
What is your intercooler plan?