Mine was running 297bhp @ wheels (graph to prove) and is only runnning on yellows. Fuel economy is horrific though - around 7mpg when I put the pedal down! All advice above is good, and I would definitely go get it live mapped when you have done your upgrades. Live mapping is better for the reason the map is specific to your car and it is done when the vehicle is under load out on the road. So far as I'm aware?