You can match up another system to the Unitronic system. It comes with the reducer
We run the full Unitronic turboback on our MK7 gti project car though. more info if you want to check out videos/info on that car
Yes, most DPs reduce to the stock 2.5" diameter then the 3" exhaust has a 2.5-3" adapter. Ideally you can take it to an exhaust shop who can do a direct connection with no reductions.
Most turbo back exhausts usually don't have this reduction since they know you're mounting it to their exhaust system.[/QUOT
well thats a relief knowing i have options on a catback exhaust system with this downpipe