Really annoyed of late. My 21 Screw FX4 when it rains here in the PNW, I hear a sound like water running through pipes then hitting something on the way down. It is in the A pillar area/where the 2 doors meet on the driver's side. My wife and daughter heard it as well. Is this normal...
My 10/4 built S-crew has the same issue. The drivers mirror sounds like a wind tunnel. Shitty that Ford would design such crap. Nobody in FoMoCo sat in it in the wind tunnel? Guess I'm going to buy the tow mirrors.
Have my 21 for 6 months now with standard mirrors. The driver side sounds like I have a window or door partially opened, which is not the case. Pulled the mirror, in no noise. Pushed it back out. Sounds like I'm in a Cessna plane. Gonna get the towing mirrors asap.
My dealership had the bed liner, ceramic paint coating and upholstery treatment done upon arrival. Also, they installed the hood deflector. Already came with the factory wheel well liners. All worth it IMHO. Good luck!