Twin turbo set up
 

I have a 2014 6.4 putting twin turbos at 6psi total. Anyone know what whp that would roughly put me at

Guessing around 750 RWH

Kind of depends upon a lot of other factors. But, ya. A lot for the street.

I was looking into boosting my little Ford 10lbs and the general ballpark gain was 50 percent net. So 500 hp boosted 10 lbs 750 hp but there are variables like base CR, fuel, heads etc.
There's no set number or formula for this question.

If I had to give an answer it would be not enough.