Make your diesel more efficient and fun to drive with our Ram Cummins 5.9L Stealth Performance Module exclusively for Ram Cummins years 2003-2007. Your module will be a stand-alone computer that simply plugs in under the hood of your truck. It will not increase fuel volume, so there’s no need for any other modifications. Make your truck work smarter, not harder! Get that extra boost in performance without any harmful side effects.