fitted a diesel box still goes well cant fault it, dint see much difference in engine speed when cruisin at bout 70 was about 250 rpm lower at the most, and now i have chance to give the car some abuse lol i get to 90 and my boost drops to bout 2 psi, anyone got any clues? is it most likely to be the amal valve cos i was thinkin if it was the actuator surley it would hold boost at all?

Rich