Hello, I have a 2019 F-150 with the 5.0. After sitting for a short period of time usually 45+ minutes, I have noticed that the engine/exhaust is louder than after I drive for a little while. Most of the time is when its cold and hasn't warmed up yet, however sometimes it will do the same thing after its been sitting but everything is still up to temp. FYI, the truck is straight piped so I can clearly notice the difference in loudness. This isn't an issue at all, just wondering if anyone knows the reason/cause behind this. Feel free to ask any questions.

 

Louder exhaust at start is generally due to the fuel being rich.

 

Choke

 

Cold starts are always significantly louder as the truck will idle at a higher RPM.