My April ‘06 is a non sport model. No air suspension on it. The one key option I didn’t find when looking for an X5 was a towing package. M54 was my only preference. I chose mine based on info gathered from this site. A Foxwell Pro has served well. To complete my set up, I need software to code new modules and make changes. Good luck. Finding one under 100k miles is sweet. You can base maintenance on items needed as they wear out.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)