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Message: <blockquote data-quote="jason" data-source="post: 611091" data-attributes="member: 182">Have not had the chance to taste both options.  I have only listened to the stock system in the test drive car which was ok for my taste.  Cars are never the place to experince audiophile level of music performance so I never expect very much.  One can only assume that because its more (expensive, speakers and amplier) that it should be better, but u know what they say about assuming.  BTW you do not have the pleasure of choosing between the 2 options as BMW Malaysia dictates what comes in the car.Eco pro is similar to hybrid in the sense that the objective is to save fuel.  But the technology is quite different.  Do a search to find out more.Jason</blockquote>