Put the Eisenmann on first with the factory resonator. If you enjoy the sound as is, don't worry about the Xpipe. If you are longing for more after the Eisenmann, do the Xpipe.

Personally I think Xpipe plus aftermarket exhaust is too much.

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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