i dont expect a vvl on stock cams to perform that well on a t25. The vvl hates restriction on the ex side. If you make over 250whp on 8psi i will be surprised.
I would say 250 with a good tune and 3 inch is about normal, maybe even a little more. This is the only dyno I found quickly but it wasn't a 3 inch after the dp and he tuned on a g20 ecu with safc. 238.8 whp on stock Nissan exhaust manifold - SR20 Forum
Three lbs should net you a decent gain on the VE, possibly 20 or so whp. Its up to you but I would run the 10psi all the time so no need for a dual stage boost controller really.
Originally Posted by XxToKeSxX invest in a wideband my friend. And if you are going to stay with the t25 and are living in AZ, an exhaust gas temp gauge wouldn't be a terrible idea. Also, you can run a datascan as you drive to read on your injector duty cycle.
Do you have a way to monitor injector duty cycle and do you have a wideband? We can say to you many suggestions but all the variables can be different due to many things... I can say you could get away with 22psi and the next person can say: dont go over 7psi or your going to blow a hole in the motor...