There is a lot of talk about exhaust drone on this forum and others. I know I've read one person claiming they have no exhaust drone and another with the same exhaust claiming they have considerable drone. The subject of drone is not SUBJECTIVE as some may claim. It's either there or it isn't. There is drone and there is exhaust SOUND. They are two different things. If a certain make/model of muffler or catback is causing drone for one person it also will cause it for another on the same type of vehicle unless there is some type of problem with installation that is causing an exhaust leak. Since it is obvious that some people to not understand or realize what exhaust drone is, they then don't think they have any.
Some people seem to think drone is only something you experience at highway speeds above 50 mph. It's not. If you are getting drone at high speeds on the highway, your also getting it at lower speeds around town. Speed doesn't matter, it's the RPM range that matters. It's in the 1500-2000 RPM range that drone usually happens when the engine is under a load and that can be at a variety of speeds depending on what particular gear the transmission happens to be in at the time.
I ran across a video clip on you tube that is a good example of what drone actually is. The clip is of a Nissan Titan with a Flowmaster 50 Delta Flow model muffler installed. It makes no difference what brand of vehicle, you can spend time on forums of any brand of truck and see plently of discussion on the subject of exhaust drone. I'm not picking on this particular muffler. I chose this clip simply because you can clearly hear what drone sounds like and to help people to be able to identify it and possible cut down on the confusion of what is and what isn't drone.
The drone is on the second half of the clip after the guy switches to filming from the interior of the truck while driving around town.
YouTube - Titan with Flowmaster 50