If its making noise now, just be sure not to use M1! I'll bet ya it gets much louder!!
I've read a lot on this issue in the Hemi's. Many have solved it with the use of 10W30 Pennzoil and a bottle of M0S2. My uncles 2011 did it terribly until he began a steady diet of Pennzoil Conventional 10w30 and it is quiet as a mouse now.