I haven't gotten underneath the ///M coupe yet, but on the E9x series the cover is meant to keep the engine compartment pretty "sealed". Water, dirt, etc. can certainly get in. All I can say is that if it were me I'd want to replace it. Check out Tisher for parts, I'm sure BMW at the Roseville AutoMaul would jack up the cost.
Someone else can chime in with more technically astute comments.
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