All modifications to the car have potential to affect the warranty (including things like Carista / OBD11/ VCDS) because its not how the car rolled of the production line.
Why do you need a dsg map in simple terms you have changed the power output from the engine so the gearbox needs to be changed to support that. Plus the mappers will add in extra safty features and extra settings that the stock car did not come with.
Example on a stage one map (DSG)
- Launch Control variable RPM
- At 0-30% throttle launch RPM is 2500
- At 45-60% throttle launch RPM is 3000
- At 70% throttle launch RPM is 3250
- At 85-100% throttle launch RPM is 3500
- In Launch Control Mode 6300rpm rev limit
- In Drive and Sports Mode gear shifts at 6500rpm
- In Manual Mode gear shifts 6600rpm
- In Drive and Eco mode at low RPM, 2nd gear is held unless you come to a stop
- Removed 'Kickdown' in Manual mode
- Optimised shift speeds
But you can carry on with modified engine and stock gearbox.
For me the point of modding is getting the perfect car for ME which may not be what you want.
Car manufactures build cars to sell to the majority and its very rare to find the perfect car off the shelf