If you want quieter you won't get that with swapping mufflers. Not even sure why you would want quieter because stock is pretty quiet.

FYI most of the Walker OE replacement stuff is aluminized rather than stainless like the factory, meaning it wouldn't last very long.

 

FYI most of the Walker OE replacement stuff is aluminized rather than stainless like the factory, meaning it wouldn't last very long.[/QUOTE]
The one for the 2016 F150 5.0 is stainless steel

 

I understood the "piped in noise" was just for the v6's

 

Didn't know that, their OE replacement resonator is aluminized or was last time I looked at it.

 

Says new beside Stainless here are the specsNotesMuffler design includes a rod hanger on the inlet head and a rod hanger on the outlet head. Body Height7.000" Body Length25.000" Body Material - NewStainless Steel Body Width9.000" FinishNatural Grade TypeRegular Inlet 1 Inside Diameter2.750" Inlet 1 TypePipe Connection Inlet ConfigurationOffset Inlet Quantity1 Muffler TypeCombination

 

I completely disagree with OEM is always best and that the Ford designers designed it to work best for our F-150 is incorrect. Ford always designs and leans middle of the road between economy and performance. If you want to go one way or the other there's always room for improvement. Stock mufflers are quiet but ARE restrictive in exhausting hot gases due to the chambered baffling design. A straight through system is best for performance but it's extreamly loud so where do you fall for preference, Ford picks the middle.

Turbo mufflers are the compromise between a mellow note with a less restrictive exhaust sound then stock and is a good compromise if you don't mind a little louder then stock volume.

ln general terms, the difference between a resonator and muffler is a resonator is for sound and a muffler is for volume. If you run just a resonator you'll have a louder, nice sounding low rumble. If you only run a muffler only you'll have a quieter system with an average sound. My 5 4L stock system has a splatty shush sound when you get on it and sounds awful like it's being restricted if you run both you should have a better low note that's quiet.The main differences between a resonator vs muffler are:

• Resonators offer a sound level that’s almost equivalent to a straight pipe, whereas mufflers lower the sound level.
• Resonators cancel certain frequencies to eliminate obnoxious noises, whereas mufflers do not stop droning.
• Resonators have little to no baffling, whereas mufflers are designed with quite a bit of baffling.
• Resonators do not reroute exhaust gases and create less back pressure, whereas mufflers work to reroute exhaust gases while creating back pressure and lessening noise.
• Resonators can increase performance, whereas mufflers tend to restrict it.

Hope this helps. Here are good references

Types of mufflers explained
https://www.theengineerspost.com/types-of-mufflers/

Difference between resonator and muffler
https://axleandchassis.com/engines/r...or-vs-muffler/

 

For the OP, if you want quieter than stock my only thought would be additional resonators or mufflers while retaining the stock muffler. There isn’t a lot of room for that under the truck, but might be able to make something fit.


I do agree that most stock mufflers are a compromise, but the stock ‘15-‘20 F150 mufflers are a straight through design, not chambered. The stock bottleneck is the 2.5/2.75” piping around the resonator, which is also straight through but at the reduced diameter.