How many miles and has it ever been done before?

Mine was original at 85k-90k and 12 years old when I did it in late 2015 and I well exceeded the age lifespan of the original system (the winter was brutal and she was making some horrible sounds) -

At the age of the vehicle it should be done, regardless of mileage, if its original - IMO

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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