It's an NA motor, you can do the regular 3 mods but you'll maybe net 4-5% gains if that.

Software tune (Dinan, ESS, etc), fresh air intake (AFE), and performance exhaust (Remus, Eisenmann, Billy Boat), would be your normal progression.

Any more power needed and you'll need to delete the cats and do headers, or go to forced induction.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards