I put the 4.8iS axle back exhaust on mine, looks great. Go to a muffler shop and have them chop out the old mufflers and weld on some nice quad tips or something

Also, the 4.4i exhaust sections should bolt right up if you can find them from a wrecked X

Or just have the old tips cut and new ones welded on like tmv did on his old X

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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