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Perhaps the extra metal on the Heavy-D gives it some extra rigidity so it won’t warp, but I’d be surprised if the SD OEM replacement diffuser would warp. It’s really built out of thick steel. SD mentions a couple of times on the product page that it will not warp. If you are interested in it if it doesn’t warp, might be worth giving SD a call and see if they guarantee it won’t warp.I did see that also, but then some of the reviews on amazon said that it warps also!
Best Greg