I picked up an inline pro kit and previously the owner made 460whp on 18psi with a 3mil HG on an AP2, So am i hoping for too much rwhp at 400 on 12psi oem headgasket? 3in Dp and 70mm invidia...

Looks like that seems a bit more than i will make from reading other peoples dyno numbers.

 

Whats the rest of your setup? Who and how are you going to tune it?

 

all dyno's read differently.

 

Why are you only running 12psi?

 

Dont worry about psi! Tune it up to 400-450whp and see how it goes. It wont take that much boost to make 400whp.

 

Imo, be careful with pumpgas, forced induction and stock compression.
I havent experienced any problems myself, but I use e85 to be safe(er).