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Message: <blockquote data-quote="supergripen" data-source="post: 291931" data-attributes="member: 1254">how much slower is ur car compared to the vid? a shorter/higher diff will give u more 'scoot' but u'll be cruising at a higher rpm at a given ratio/speed thus giving u higher fuel use and also higher noise levels ..so i guess it is a matter of personal choice,what u want ur car to do for u.finding a ratio that will give u a nice balance between pick-up,driveability,refinement and relative fuel economy should be the way to go.so choose wisely..on a sidenote,does anyone know if the ratios on an m54 525i the same as one on the m54 530i?bro,let us know what rear diff u decide on later.good stuff this.. maybe some one should change the name of the topic.</blockquote>