I think I was the 1st to have posted on this issue, and there were maybe 4 or 5 others that also posted similar experiences.
In my case, I believe a portion of the contributing factors to this vertical hood shaking, or hood flopping occurrence was due to me having cut open the engine hood, in order to insert the 2013 Mustang GT heat extractors.
I believe this may have contributed to a partial loss in designed, structural integrity.
However, I was surprised to have read posts from a few others (who's hoods were still in factory condition / unmodified) that experienced the same issue.
Essentially, what we found was that there was noticeable, vertical hood flopping, in speeds in excess of 120MPH.
In my case, I *may* have been exceeding the above given figure, when I began noticing what I would say is/was "severe" up & downward movement of my hood.
The primary latch gave, causing the hood to pop open at it's very most outward point (end of the hood, closest to front of the car).
I immediately deceled & thanked my lucky stars the hood didn't completely blow off.
I theorized that since I had my large engine belly pan off (for intended cooling purposes) that at those higher speeds, the volume of air rushing under the car, and into the engine compartment itself, was so great that it caused this observed condition.
Adding to the problem, I believe, was the fact that that volume of air, was getting expelled through the installed heat extractors.
Not entirely sure, I replaced the larger (of the 2 under belly pans) & attempted to recreate the initial environment.
The vertical hood shaking / flopping was NOTICEABLY less, but still present.
The few others that noticed the same thing, never modified their hood, but did have the under belly pans removed. Once replaced, condition decreased for them, if not ceased entirely.
One person also posted about the primary latch having gave way, causing the hood to open at the end, but like in my case, they also stated their secondary latch held out & kept their hood from blowing off.
I spoke to my body shop peeps about installing hood pins, which they said they could do, but the recent body/paint work I had done on my lower rockers & rear valance, along with the repairs of my front lower spoiler & clip, were a tad bit more expensive than I was originally led to believe.
Therefore, i've held off on doing the hood pins (for now).
I guess as long as you're:
A.) Not planning on going in excess of say... 120MPH+
Or.....
B.) Not tracking your car (& having air lift your car up by filling the engine compartment with air at higher speeds)....
Then you would most likely be just fine by removing it.
Hope that sheds some light on the subject matter.
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