Do you have a DSP button on your radio?

If you do, you have DSP. Your choices are limited to Dynavin N6 if you want an easy install. It is a great unit.

Don't know much about that unit but you do know the openings for the E53 have rounded corners right?

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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