Fitment: Charger 2005-2010; Challenger 2005-2010; Magnum 2005-2008; for 300 2005-2010.
This plug is used in place of the MDS valve on engines that don't have a Multiple Displacement System (MDS). Four of these plugs are used with sets of tappets to convert an engine to non-MDS. Ideal for engine conversions in street rods & muscle cars that don't use MDS.