The standard power of your Audi A8 3.0 TDI 250hp vehicle is factory 250 hp / 550 nm. After Audi A8 chip tuning custom vehicle software, your vehicle will gain +50 hp / +100 nm additional power and reach a total power of 300 hp / 650 nm. Since there will be no change in the exhaust emission values of your vehicle, there will be no smoke in your vehicle.