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Message: <blockquote data-quote="kaizen" data-source="post: 582141" data-attributes="member: 24522">Ade, infact having test both the 520i and the 528i, it is clear that the 528i is more responsive and raring to go. It will be interesting to see how many N4 520i owners chip their ECU. There is actually a huge after market for the likes of VW. So, there could be a new phenomena or do 520i owners not fall into this tuning markets. My SA claims that there is a lock code that needs to be "cracked" for tuning to happen.Read in one post that we should do at least 3 test drives before we decide. How many of you agree to that. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>