I am thinking about purchasing this "bov" for my turbo setup. And I was wondering which spring should I get? I plan on running a T3/T04E w/a tial wastegate and a .45bar spring. I also plan on running a Greddy Profec B set to 9 psi and 12 psi. So should I get the 6-12 psi, the 7-14 psi, or the 12-18 psi spring? TIA