Argyle14

I test drove my truck this past Thursday after the dealer bypassed the valve. The service advisor rode with me and the noise was still there. They already replaced the exhaust. The noise I am having is this whistle like everyone is talking about at highway speeds and lower speeds. The noise is only the while I have the gas engaged. Let off the pedal and it goes away. Truck is still at dealer. They are lost

Luckily I have no vibratation, just the noise

I have no vibratation, just the noise. Truck is still at dealer, they have not called me with any kind of fix.

I have this same issue. My truck is back at the dealer for the 4th time trying to fix this whistle noise that kicks in at certain speeds. Any idea on how to fix? 2014 4.3L V6 Crew cab Silverado.