I upgraded the sound system on my diesel since it was my daily driver and I like good tunes.

I'm a big MBQuart fan, I've installed them on two other cars and will upgrade my OEM Bose's with them after warranty.
However, for the diesel I went with JL Audio all around and 8" Sub. You are missing amps, and if you go with Alpine as I did you will have clean power to drive the well rounded sound dynamics of JLAudio. I think the dynamic range of upper end MB Quart's is lost in the din that is the diesel compartment....JMHO

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Ed "Don't Benz's just feel better..."

Current wives...
2000 ML430 Skyview "The Mel"
2000 CLK430 Cab "The Cab"
85 300D Turbo "The Diesel"

Past wives...
92 300E
85 190E

"One should as a rule respect public opinion in so far as is necessary to
avoid starvation and to keep out of prison, but anything that goes beyond
this is voluntary submission to an unnecessary tyranny, and is likely to
interfere with happiness in all kinds of ways."
Bertrand Russell