Could whine which sounds like a power steering line be power steering whine? Lol, the earlier hemis and piles of problems with the power steering on them. Check the fluid and make sure its up. As for mods, depends how crazy you want to get and how much money you want to spend. Tuner? Cam? Heads? Forced induction?
2004 Dodge Ram 1500 Hemi Sport, AWD, Muffler delete