the diff cover with fins is a NISMO part. it is not a revised part, unless you're in dubai or other markets where extreme heat is an issue. a diff whine could be many things. if the rear diff bushing was replaced, then you'll likely hear a whine, depending on how it was installed. also, if the VLSD was swapped out with an aftermarket unit, then a whine would be more pronounced as well.
the diff cover has absolutely nothing to do with a diff whine
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