Apparently the composite upper intake on the 5.7/6.4 Hemi's has a problem with the intake bolts loosening up over time. After noticing that the idle on my newly acquired 2016 Challenger is not as smooth as that of my 2017 RAM I started wondering about what the difference could be. I checked the intake manifold bolts on the Challenger and they were no tighter than 40 in/lbs tops against a 105 in/lb spec. It did improve the idle somewhat by the way. I decided to check the truck yesterday just for the hell of it and they were even looser than those on the Challenger. Anyway i was just curious if anyone else had ever read anything else about this or had a similar issue.