OP, John has gone out of his way explaining the general principles of 2.0T tuning.
He has conducted himself well, and offered a great product at very competitive prices.

As for the basic ethos of tuning, there is plenty of information on here, vwgolf.net, golfmkv.com about the options (software, DP, HPFP etc). It would take a lot of strain off John you finding out what you want to do with the car, and what you need to get there. Then make contact with the relevant people.

Much easier, HTH