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A lot of sound quality has to do with the source. If you're listening exclusively to XM/Sirius, give up on hearing decent stereo separation, bass response and soundstage. Even MP3s streamed from an iPhone via BT sound muddled on the best car sound system. But CDs should sound fairly pristine on a $3400 upgrade. It's definitely something I want to read more reviews on before I order my F90 in a few months when the 19s come out.
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 2019 M5 Rhodonite Silver// 2016 M4- retired// 2011 750i- retired// 2004 740i- retired//
2001 740i- retired// 1998 M3- retired |