I am gona get a custom downpipe, so the TT downpipe with the QTP electric cut out welded on has to come off. I am still in the process of finding a shop to do this custom downpipe It's a stainless steel downpipe, and I believe the TT downpipe has 2.5" ID. It fits automatic/tiptronic B5.5 1.8T. it could be mounted to the stock catback with an adapter. the QTP cut out come with all wires and the motor. I am not sure if the DP would fits the B5.