I can confirm the revo stage 1 map for your engine is wonderful and you have dsg which means you can have the full beans map. I have it on my estate Golf R and will soon be going stage 2.But and this is a big but - do you really want more than 300 hp going through the front wheels? The
reviews I have seen suggest 300 is already pushing it.
Had revo stage 1 on previous R hatch and no problems either.
Perhaps a better option to start with is to go for a pedal box - presuming the
cupra's accelerator pedal response is as crap as the R's. I have one and it gives the car a whole new lease of life.
I will be replacing our leased pug 208 gti sport with a manual
Cupra 300 in Aug and will not be tuning it.
ETTO of course and some good points made above.
EDIT! OH WAIT THE ST DSG IS AWD. GO FOR IT WITH THE CAVEATS REFERRED TO IN ABOVE POSTS. Worth getting revo turbo pipe and elbow, revo panel filter and revo turbo res delete to start with too. Then the sky is the limit!
Haven't bothered with the dsg map yet. I also have serviced by highly reputable indy Vag specialist -still in warranty -well sort of! They also did the tuning.
If you have to go to a dealer for some work then tell them not to go near the OBD port. Or if they have to at least no new VW map please. I had a faulty inner window seal replaced, which has nothing to do with tuning. Window was making huge squeaking noise when opening/closing. No need to go near OBD for that.