Quiet knocking/clacking noise

2013 ram 1500 hemi 138k miles, only aftermarket parts are magnaflow muffler, front strut/spring leveling kit and airlift load lifter in rear. I’m getting a slight knocking or clacking noise on the passenger side, sounds like either cylinder 6 or 8. Is it possible for a leaking exhaust manifold to create that noise? Is it the cam slapping a little bit? I was hoping it’s just from exhaust and to just put new shortys on it. Any knowledge is very much appreciated.