After owning my S5 3.0 for a year I took the plunge and had a Stage 1 remap by SA Tuning. Stock the car made 321.1 bhp, but after the tune 413.4 bhp. The difference is awesome, engine response is quicker and acceleration is on another level. Sedate driving seems to be giving better MPG too! Very happy with the result, might go for a DSG tune next.