someone i know has fitted a dumpvalve to there cupra r turbo. basically they have taken off the pipe from the recirc valve and put the dump valve in the pressure side one. on the other pipe the recirc valve is still there but the feed is taken off and fitted to the atmo valve. the connection for the feed to the recirc and the connection to where the pressure side pipe should go have been blocked off. problem is at low revs or changing down etc it seems to cut out at times or if it keeps running it is very unresponsive then all of a sudden it just goes.
just lookin for some ideas to what the problem could be