Sound dampening for engine compartment

[HFarr]

I added some 3/8" sound foam to my 2021 Makai, it whined loudly too, and it helped a lot, but you can still hear it. I will do floor panel and maybe engine side panels next. Just with what I did on the trans cover, now when new people get in the boat they don't immediately ask me what that high pitch squeal is. I also put a 1" wide strip around the back wall of the boat right below where the trans cover touches it. This closed off the gap that is there, and you can't see the foam. I didn't take a picture if that, but will when I take up the floor to do it too.

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