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Tarnock Garage are a very good bunch.
Rambo goes there whenever he needs the car doctor.
Definitely get the remap if it's free. However, don't forget that your buddy will need to declare it to his insurance company as a "modification".
This may well affect his premium.
Worth checking before getting the remap.
That said, the ST is a wonderful car even when it's standard. He won't be disappointed whatever he decides.