430 Uh oh! Does anyone know what this sound is?

I was driving for about three and a half hours at an average speed of I'd say 90 miles an hour, pulled over to get some v-power shell gas, got back on the highway and started to accelerate and as I approached 75 to 80 I started hearing this sound. It happens even when I shift the F1 trans into neutral at those speeds and with the E-diff turned off. If you can't hear it from the video It sounds like a tarp flapping off of the back of a truck or a flat tire. I I can continue to floor it and shift through all the gears no problem just this noise starts usually happening at around 80. The car does seem to drag a bit when the sound is heard. Any help in trying to figure out what this is would be greatly appreciated especially since I'm on a 5-hour trip from home. I need to know the best next steps in a Ferrari mechanic desert in Mackinaw Island Michigan.

 

Also, it is throwing no codes

 

On the dash that is. There is seemingly nothing at all wrong according to the car.

 

Oh my Lord! You guys are the savior of my weekend. I'm here trying to treat my girlfriend to a great weekend up on the island and then do a lighthouse tour back on the western side of Lake Michigan in the Ferrari on the way back to our hometown in South Bend Indiana. I had replaced a bolt on that under tray last year and I am almost willing to bet you are totally 100% right in that it probably vibrated loose and that's what's flapping. I'll find out when I pick the car up from valet on Saturday morning. Thank you so much guys! You don't know how much this has saved me from potentially ruining my girlfriend's weekend due to stressing about this! Thanks again!!

 

LOL! My girlfriend told me last night, "Ain't nothing like Gorilla tape baby!" LMAO just read your reply to her. That great man!

 

So, I was just able to get car over to a local body shop up here George's Body Shop:
All the screws along the entire forward edge of the diffuser had come out causing the flapping noise. It also cracked a small, half pizza slice sized, piece of it off in the middle of that edge. Also on both sides of the diffuser where the diffuser touches the bumper, the paint is chipped from the flapping. So, new screws some gorilla tape and some touch up paint and we're back in business . Thanks again Gents, it's like having a family that I've never met before but get great advice from!

 

Thanks! I will check the schematic on that! Perhaps that's the reason they loosened in the first place as I did have that diffuser resprayed last year. Thanks Again!

 

Thanks! So, I recently had the oil changed. Would you say that in order to take off that rear tray that you would have to undo, or perhaps just loosen, the middle bolt into the diffuser or all of those bolts on that leading edge to get the rear tray out?