I think I paid around £300 to do mine. They had two options: MPG (with a little extra power) or a full on Power Map. I ended up going for the power and it added around 40BHP and lots more torque.
I got mine done at Top Gear in St Albans. They bring in a specialist there who was great. He also said he can do a map to get a A4 CAB (which usually has 140bhp) up to 400bhp. Bit to much for my front wheels and MPG I felt!!
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