The diffuser is a molded plastic not painted. It's almost identical to the one on my X1 and a 435 I saw in the showroom. It's darker but it's definitely a molded plastic probably a polycarbonate. I'm not an engineer but I did stay at a Holiday Inn Express recently.
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1995 325i, 1996 328ci, 1997 528i, 1997 Z3 2.8, 2000 528i, 2001 X5 3.0, 2001 330i Convertible, 2002 M3 Convertible, 2003 M3 Coupe, 2004 M3 Coupe, 2004 Z4 3.0, 2004 X3 3.0, 2007 X3 3.0, 2007 335i Convertible, 2013 X1 28 sdrive, 2014 M235 manual, 2020 X3 30i Xdrive
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