Tom26 certainly has missed a lot. I'm guessing he's read too many threads where people have misguidedly replaced the excellent quality electronic injection and ignition system with a K-jet mechanical system.
It's a sort of de-tuning exercise conducted by those with moronic tendencies.
A standard ABF will respond to chipping, but not as dramatically as yer TDI, 1.8T etc as there are fewer variables to tweak, matron. Danny's tried various chips on his, but none felt better than the standard map, curiously.