RE: Performance upgrades 2005 5.7L HEMI
A "hard time finding stuff" where you been lookin'? I think the Hemi is getting as large or larger aftermarket performance support as any engine produced today.
Let's see, after your current mods, you could add:
low temp t-stat
springs, retainers, etc.
wires, plugs, etc.
and that's just a start...