Originally Posted by davecosworth
hello mate there is a electronic valve that sits on the bulk head with two vacume hoses that goes to it on a mk3 and mk4 xr3i this is what i used b4 i fitted a twin piston dump valve to my rs turbo the valve has two black wires that comes out of it.
I'm not sure if that will do the job though because as mentioned its still a wise move to keep the boost pressure going to the dump valve