check out www.boostvalve.com i've had one for about 4 years and it has never failed me once. I bumped my boost from 5.5psi to 10psi (old turbo) and it held steady with no problem, then most recently I used it to bump from my 9psi sping to 13.5psi and it held steady. Never had any issues with spiking or creeping. Best of all it's cheap.