Yeah I am running the stage 2 wastegate with a MBC and I was toying around with the setup yesterday and the best I could hold was like 12-13 psi while spiking around 18. Does anybody here actually have a map clamp installed? I did mine yesterday and I'm going to the track (Sunshine) to tune it tonight but I want to know how you check the clamping voltage. At idle with a voltmeter all you see is the .6 volts or whatever b/c you are at no boost so do you have to be at WOT to see what it clamps at? I would rather know what volt the map clamp is set at before I go and run the car, I have A/F and EGT guages and will be datalogging but I'd really like to know "ok this time its set at 4.2v lets see how it does" or "ok this time its set at 4.1v lets see how it is different". Any ideas?