From what i can see i think this is how they set it up.
The boost pipe from above the radiator is replaced with one of them t piece ones, they they got a forge diverter valve, same as what my s3 has dv007 i think, then they use a 25mm? silicone hose to the charger inlet, the vacuum pipe is then run from the top of the diverter valve to a t-piece the is fed from the fuel pressure regulator (you can see it all in red) take the t-piece off the throttle body, cut it off and then get a plate welded on it. A few people that go turbo do the same to the t-piece. Then the diverter valve works just like a dump valve. I think diverter valves suit turbos better rather than superchargers, as it helps keep the turbo spooling or something? Not really sure.
I thought about doing it to mine as i dont really like the t-piece always being open, could get a filter but this looks better