Yes, BMW is very easy (I'm one of the Bimmerfest devotees). For BMW just get a JB4 or any of the many piggyback, custom rom, or even replacement roms and your done. The thing nobody has really mentioned in this thread though is that all you need to do is look up CanBus, or which ever protocol your car brand uses, get yourself a compatible 2-way ODB2 cable, and hack away... Most all cars are hackable now. This is /. right? I mean if the OP wanted to just buy a chip he(or she) wouldn't have asked for "hackable". My Bimmer is set up now so when I press the fob for lock, it locks the doors, rolls up the windows, closes the sunroof, and foldsz in the mirrors. Unlock short click unlocks doors and unfolds mirrors. long click reverses everything with windows down too. That's just a sample of whats easily done with a small amount of homework. Lights, etc... are all there to play with.