Quoting dollaricd885:
^^^that is what i am doing same psi and all. but mine stays at 12psi till 4200 rpm then goes to 20. somthing wrong that i have to work out.
I think it's just a question of altitude and turbo choice. I have a s16g with an Evo3 hotside. When I lived in Portland (sea level) the waste-gate was 12psi creeping to 15psi at redline. Now that I live in Bozeman, MT (4,800 ft) the waste-gate is a rock solid 10psi all the way to redline. I wouldn't worry about it.