2000-2006 s430 s500 s350 How to remove radio Install Apple carplay android auto Metra kit 95-8734w 

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Oh no ,you can not have two amplifiers connected to one speaker .that's what you just did two amps on the speaker.you would damage the radio as well as the factory amplifier if you have connected to the speaker .disconnect the factory amp .Hopefully, the radio output chip isn't damaged

All functions are controlled at the touchscreen

No,we did run wires from amplifier so no canbus connection needed

It's 95-8734b for black w for wood