I decided it was time to chip my Audi TT. I contacted the nearest APR reseller who is a well respected German car specialist that I have used in the past.

He told me there was no problem loading one program in the ECU. It was plug and play. No installation cost.

To do more than 1 required them to solder in an additional EPROM. He went on to say that after time the ECU can have difficulty communicating with the new EPROM.

Does anyone have experience with multiple APR programs ?