Yeah, was debating retrofitting the ventilated comfort seats too, but there are too many other electronic parts which need to be replaced, plus the target car will need to be coded.

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09/1996 M3 Alpine/Modena manual sedan (1 of 26)
05/1998 M3 Estoril/Grey automatic sedan (1 of 185)
09/2011 X5 35i Alpine/Schwarz Premium