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Makes a noticeable difference at every speed but especially at highway speeds and on the twisties. Highly recommended. Had it in my F10. Drove the G30 (540, 550) with and without. Couldn't imagine buying it without (would have probably gone with the E43 if it wasn't an option, TBH). Also got to compare M550i with and without. The difference was even greater on the 550i relative to the 540i, which came as a surprise since I thought the 550 was supposed to be set up to be sportier. The extra weight really makes itself known without DHP. I found the 540i w/ DHP to be the sweet spot for handling, but YMMV.
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