Bill,

Given the very low impedance of your factory speakers, replacing them will result in very low volume from the replacement speakers. Sure, you can replace the head unit, but it won't work with the car's factory amps & speakers. So, it's all or nothing.

Sorry!

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo