Mercedes S65 2014 Stage:Stage 1 We recommend a one-step colder

We recommend a one-step colder spark plugs for better performance

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

All the instructions are in the box

If you ship it via Overnight

Check engine light removal for catless (off-road use only)

Mercedes S65 2014 Stage:Stage 1 We recommend a one-step colderExpertly 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