BMW 640xi 2017 femto Stage 2 and above requires

Stage 2 and above requires that you gap your spark plugs to

Done at the comfort of your home with your windows computer

More horsepower

Top speed limiter removal

We also recommend changing your spark plugs and Primary O2 sensors every 20k miles

BMW 640xi 2017 femto Stage 2 and above requiresExpertly calibrated and meticulously refined, DME Tunings ECU software is guaranteed to give you MORE of a good thing. More horsepower, more torque, and a more exhilarating driving experience by delivering usable power through improved throttle response and torque management. With additional ft. lbs. of torque through the mid range, acceleration out of your favorite corner and onto the straight is noticeably quicker throughout the rev range. DME