Modern day cars are making new tuning methods easier to use. Modifying the cars electronic control unit allows to use different programs to control fuel mixtures and ignition timings.
You can achieve more power or better fuel economy with chip tuning.
Example with BMW E46 330D:
- Stock ouput power is 204hp and torque 410Nm.
- With power chip output power is 245hp and torque 500Nm.