Sorry I would never get a performance chip on a luxury car. Majority of the time, people are interested in performance chips due to the added speed. You should not get into that unless you will be participating in a race. Moreover, these chips have a couple of downsides as well. If you think logically, they increase the pressure on the car's engine and the overall performance instead of genuinely improving it. Anything this chip does to your car after installing it .. is not covered by warranty since it overrides the performance of the original chip and system installed in the car.