I have a 2002 GS300. It has the Mark Levinson system. Alas, it also has the Navigation system, which includes the HVAC controls in the touchscreen and makes it impractical to replace the head unit.

The ML system is pretty good, but there's certainly room for improvement. I'm considering upgrading the speakers, but I'm concerned that the stock amp won't have enough power. This has raised a few questions:

Does anyone know the specs for the ML amp?

Is there an aftermarket amp with more power that will replace the ML amp and still be compatible with the stock head unit?

Are there connectors compatible with stock available?

Thanks.