I just thought I'd share my opinion of the Shark Stage 2 STS system with you. I was looking for a tuning company that offered a hand held unit, from which you can switch between your car's actual original map and a performance map.
I had a Blufin on my last 8P S3 and I was totally unimpressed with it, so that was out the window. All I can say is WOW, pulls like an absolute train now. Was just as easy as Blufin to use and offers the same immobiliser and diagnostic facility, but the results are so much better. I haven't had it rolling roaded yet, but Shark claim 330BHP and it feels at least that. I also had a Revo Stage 2+ on my last car and this doesn't feel far off that. I was looking for a strong map that didn't require changing the fuel pump, induction kit Etc and this has ticked all the boxes. The Stage 2 does require a full Milltek exhaust and costs £600 for the unit, but it's well worth it IMO.
Along with Evolve, Shark definitely offer some stiff competition to Revo, well worth considering guys.