thanks for the reply,

I am fully aware of the warranty issue, I have a 20k mod e46 M3, and a 12k mod RS4, also my G37S have some small mod done. At the first day I dropping these down pipe, exhaust, intake, big brakes, software in the car I know there will be a risks. So far, I haven't have any problem with these mod in all of my cars up to the date I sell them. What I didn't know is "BMW gives bonuses to technicians that catch modified software" WOW! first time to me

All vehicle data is captured, is not hard for them to detect any modification software, easy money for them