AST Smart ECO VCM Spark Plug Saver, Muzzler, Controller, Compatible with Honda Odyssey [2007-2017] Accord [2008-2017] Pilot [2009-2017] Acura RLX,MDX [2014-2017] RDX [2013-2017] MDX [2014-2017] SC1

Manufactured in the USA by Aperture Science & Tech - Compatible with popular Honda and Acura Vehicles. Variable Cylinder Management (VCM) is a technology introduced by Honda on its V6 engines to improve EPA fuel efficiency numbers. It involves using the PCM to shut down cylinders at cruising conditions. During VCM, the valves to deactivated cylinders are disabled, along with the spark and fuel supply. This improves fuel efficiency slightly, however, there are other side effects that many have discovered, including Honda themselves. These include: Vibrations in the drivetrain due to unbalanced engine operation Oil bypassing Excess oil consumption Plug fouling Misfiring Engine damage Worn out engine mounts All of these issues are well documented owner complaints, which have led to a class action lawsuit that Honda has lost. Honda has issued warranty extensions covering damage caused by VCM operation for some model years. In addition, Honda has also issued a TSB for fixing those that are experiencing vibration issues. Smart ECO VCM will allow you to take control of your car and prevent ECO mode from enabling and allowing your system to run at its full potential. You plug it inline with the engine coolant temperature sensor and adjust it based on your driving style and location.