There are two vents in the rear of the cab in my truck. They were a secret to me until recently. I have the rear bench seat out at the moment, and that's how I discovered the bastards. Those things are loud!
Is there a common fix for this - a baffle or such. Or, can I just kill them with some CDL.
Are they really necessary for ventilation? I don't want to suffocate and turn blue, but anything short of that is fine by me.