I asked that same question for years. I think I read every "exhaust" post on TDR. I finally settled on the Diesel Performance Parts, ( DPP ) system. It came very well packaged, and rapid delivery. Very well made, excellent fit, all parts included.
Excellent sound at the rear, no difference in the cab, and no "dreaded drone". A 5" polished stainless steel tip, with a
"rolled" end is welded on, and comes standard with the package.
In my opinion, these people really did their homework with the design of this system. I guess you get what you pay for.
Not affiliated in any way with DPP, just a satisfied customer.
Jim