Ive had a MUS 4.3 hooked up to my E46 M3 year round for 3+ years now... including subzero MI temperatures and no problems. just make sure you dont hook it up directly to the battery on the E92 M3, use the connections in the engine bay. I also recommend getting the MXS 5, its cheaper and does the same.
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2005 Phoenix Yellow E46 M3 6MT Coupe
2007 Imola Red Z4 M Coupe
2013 Interlagos Blue E92 M3 6MT ZCP CF roof
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