I am assisting my nephew sourcing a aftermarket headunit for his 2009 W209 CLK coupe. The only thing letting the car down is the outdated in car entertainment. I think its possibly an audio 20, but can't be sure, basically a sleek looking unit but very basic with no bells or whistles. He was looking to find one mainly to stream his music from phone to headunit, as well as playing other sources of music. Not overly fussed about having in built sat nav (loves his TomTom). Have looked at a few of Alpines offerings which seem to be good but has anyone had any real life experience of doing this conversion? Any recommendation on make/model etc? Any tips on fittings? Interface harnesses? Thank you for any info.