That all sounds good, but I seriously doubt that 150cc is going to give you 75-85 hp. Orange County Correction factor indeed.
Factory EJ-25 is 165hp. In Phil's Spyder with the better breathing heads, cams, aftermarket ECU and free-flow exhaust it MIGHT be 200hp, but is more likely 190hp max. Why do I say this? The Subaru 2.5 is already in a pretty good state of tune from the factory, it is already VERY efficient.
I've driven your car. It's VERY quick. I really don't mean to disparage your ride. I just like truth in advertising.
Phil, you're talking another 50-60 hp from 150cc. An extra 150cc is going to give you 15-25 hp. The math doesn't make sense to me.
Show me the dyno sheet. If not, it's 210-220 hp all up.
This is the same power output Jake was getting with his HUGE type4 screamers (which happen to be 2.6 or 2.7 liters).