Go 3.0.
Upsolute Chip 220/221 stock + 15Hp/20lbs = 235/241
Add Supersprint performance exhaust = +3 to 5%= 245/250.
Minimal risk modifications. More luxury, bigger stock brakes, etc. etc.
Yes, you can highly modify the 1.8T engine, and don't forget the transmission to go with it, to insane...