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i would think that you would want to have a shroud with as much coverage as possible, regardless of whether you have a grill block or not.
i would say that if someone needed a higher performance electric fan, after doing a grill block, they just need to reopen their grill some.
that being said, going to an electric fan and grill block are both great ideas, i would just say to perform one first, know your temps are ok, then perform the other. other wise it would be harder to know if your fan was undersized, or if your grill was too closed off if your temps started running high.
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