Theres a bunch of e39 ls swaps out there which make the cluster and everything else work like stock. Along with stock driveabilty, seeing that the e53 is mostly the same electrics wise.

Im very interested in a ls swap with a procharger. Probably cheaper then redoing all gaskets on motor from bottom to top and a ess supercharger. With the ls its more power anyways.

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2006 X5 4.8is Fully Loaded