The MDS system is a product of the PCM, not the engine. The PCM shuts down fuel injectors and spark, cutting cylinders at cruise and other light load conditions. The basic engine is the same one that has powered any Hemi-equipped Chrysler product since the 5.7 Hemi was introduced. The beehive valvesprings are still a weak point, but I believe that most of the other technical "problems" in the new Hemi have been addressed.