650cc good on 300whp? i have about every single fine detail down about h22's and what need what im getting etc, but injectors ive never been quite sure about. i want just a bit extra room to go up a touch or run just a tad rich for safety

 

650s will be just fine with room to spare at 300whp

 

so i plan to rebuild then buy my turbo a little later so would it be possible with an aftermarket fuel pressure reg, and chipped p28 to keep the injectors in check on stock power ( or close to stock )

 

I'm sure you could if you setup your tune in whatever software you run to go off 650s. But why going through the trouble of paying for a basemap/tune just to run bigger injectors you don't yet need? Just run stock injectors and save the money until youre boosted and ready to tune...then put them in. That's what I'd do anyway.