I chose the M550
My 540i build was $72k MSRP and my M550 is $78k
even with the lower residual on M550, my lease monthly is $120 more on the M550.
but if I add M sport exhaust, xdrive and DHP to the 540 I would at about the same MSRP .
Adaptive M sport suspension is better than DHP, it is the main reason I selected the M550 over the 540
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