Want 2 psi more

[.rampage.]

I have a v2 si with a 3.08" pulley and im running 6psi @6200rpm i want to get 2 psi more how much do i need to drop in pulley size to get there? i dont want any more then 8psi. I want to just over 300 at the wheels. Dyno with 6psi with the vegas heat at 275whp.