I have recently replaced the cam and lifters on my dads truck. 2010 ram 1500 hemi. Normal problem of a lifter going down...but we went back with the lifters from a non-MDS hemi. it has a slight misfire feeling at idle. when you accelerate...the misfire goes away. Ive read that the cams are slightly different in the two engines, but it wasn't a lot. just enough to take up slack on the exhaust mds lifters. didn't know if anyone has figured out how to tune this out? still kind of new to this whole tuning thing.