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Just double check if your system is using the M.O.S.T bus, it probably is being a 2003 model.

You cannot just drop in a new head unit in and go as you will not be able to use the M.O.S.T. amp. Basically you have a fibre optic connection between the Becker head unit and the amp which is annoyingly incompatible with non MOST based head units.

If you get a new head unit that isn't MOST based then you either need to wire the speakers directly into the new head unit assuming it has its own amp or get a new amp too.

I mention all this in my blog.

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