hi have just bought an a4 b5 1.8 20v turbo, the problem is that someone has fitted a universal dump valve that i need to get rid off but cant find any info on the pipework, the turbo outlet pipe has a smaller take off thats been blanked off and a t-piece fitted just before the throttle body with the dv in...i want to fit a recirculating valve but need to undo the bodge first...HELP PLEASE