Improve your vehicle's fuel consumption with the EBY-101842AB-5684 5.7 HEMI MDS Replacement Engine Lifter from GeLuoXi.Compatible with select 5.7 HEMI engine Dodge, Jeep, and Chrysler models, this replacement multi-displacement system allows for the streamlined fuel performance of your vehicle. Shutting down to use only 4 cylinders once highway speed is reached instead of maintaining use of all 8 cylinders, this MDS allows your vehicle to run at maximum fuel efficiency.This MDS engine lifter automatically kicks the 4 dormant cylinders back on when you step on the gas to climb a hill or pass another vehicle, allowing you to focus on wherever the road leads you. Dodge's compatibilities are 2006 to 2010 Ram 1500, 2006 to 2021 Charger, 2006 to 2021 Durango, 2009 to 2021 Challenger, 2005 to 2008 Magnum, and 2011 to 2021 Ram. Jeep's compatible models are 2005 to 2021 Grand Cherokee and 2006 to 2010 Commander. Chrysler's compatibilities are 2005 to 2021 300 and 2007 to 2009 Aspen.Replace the integral unit that allows for superior fuel efficiency and engine performance with the GeLuoXi EBY-101842AB-5684 5.7 HEMI MDS Replacement Engine Lifter.