Oki, i have a gt3076 whit 63 exhaust for my new engine.
He mostly map on dynapack, it`s a lot easyer then on the Norwegian roads. It`s not his dynapack, so you have to pay rent for this also, but he is cheap on mapping and chips, he have made some chips for me, for some testing, they are free. I think you will come long whit 550-600£ total for dynapack and mapping. It depends on how ready everything is on your car, often it`s come up problems because of things aren`t right on the car, then it`s take much longer time. He lives a bit north from Oslo, not long from Sweden

Cheers