Ya i have one, i got it from ATP turbo ... it's boost activated and opens up right around 6psi, I'm very happy with it. I was thinking to get an electric one but I didn't want to have to think about when to flip it open, when not too, etc... if I don't want my car to sound loud when cruising around cops, etc I just keep the car out of boost, simple
PS - between my cut out and my dump pipe I get a lot of exaust coming out of the front of my car at full throttle, so much I can smell it in the car (got some air leaks somewhere I guess) PLUS my right leg gets VERY warm when I boost a lot, the entire hump there where the shifter is warms up pretty quick! It's not hot hot but it's like having a heating pad on your leg. So when I redo my exhaust I'm going to consider moving around where it cuts out to prevent leg-burn on long trips