^^ FLAC is a type of lossless audio codec used by hardcore audiophiles. Unlike MP3 which compresses music only to the audiable spectrum (and even that is mostly compressed) FLAC (which includes filestypes such as .flac and .aac) uses more basic RAR compression on actual .wav files, therefore it does not lose any actual audio signal.
Mike, i dont know of any headunits that will decode those formats. If you're getting that serious about sound, run a carPC directly to an amp. You can't beat that kind of control/quality over audio quality.
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, bunch of go-fast stuff