If you don't track your E90 I would say do it. I switched from E90 M3 to F01 Alpina and bought E30 for the track. I bet X5M is fun car to drive. I have X5 diesel and love it too.
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2018 M5
2009 E92 M3 race car
1988 E30 M3 (sold)
1990 E30 325is s50 swap race car (sold)
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