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Message: <blockquote data-quote="ALBundy" data-source="post: 496174" data-attributes="member: 15">Actually you don't lose top speed la, more so with automatic cars.  In my old jalopy (e34) even with a higher diff (3.64 vs 3.25), the engine revs at 2700rpm at 110km/hr. At 220km/hr it will be 5400rpm, with plenty of revs left to reach 240km/hr. For the ///M, still able to hit 285km/hr with the higher diff with a couple more hundred revs to go. With the ori diff also no better. Its just that with a higher ratio I get there faster <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> Our BMWs are not designed to be an outright pocket rocket so the final diff ratio is always a little lower, more for cruising comfort. I need more HP!!! hehehe....</blockquote>