i use a manual controller, just a modified air regulator and a vacume switch that lets me adjust the boost inside the cab , (Its not a boost valve/ bleeder valve.) i run a dual port actuator with a 7.5lbs spring. so when i turn off the switch it goes to 7.5 lbs of boost. (valet switch) then if i flip the switch its back to 12-14psi or whatever i have the dial set to..
nice for the rain and first and second gear launch.