i have a deltagate in my car for almost 2 years now and im running about 17psi with no creep problems at all using a halman manual boost controller and before that i had an hks evc IV electronic also with no creep problems i did have a creep problem with it recently and all it was were the screws were a little loose i guess from vibration i tightened them up and again no problems at all so if i were you i would just save my money and keep it