hi i have been offered a 14 day trial of a ecu remap for 2.0 l tfsi engine
from my local dealer
i was wondering how dose that work ?

Why dont you ask him?

Presumably they give you 14 days to return and they will replace the original map. There is probably some disclaimer that if their new map causes physical damage it is not their problem.

EDIT: As I click "submit" I see your message is 14 days old. How did it go :D ?