Had the A4 remapped today, some good results! Car has no other modifications, apart from been ran on Tesco Momentum.
Power run before map: 222 BHP / 245 ft/lbs
Power run after map: 251 BHP / 259 ft/lbs
Car was only supposed to be 200 BHP as standard, not sure why it was so high.
The remappers thought it might have been mapped, but after investigation it turned out it hadn't been.
I will post up a graph later.