What he says. Crutchfield is very good about knowing what will fit. Best in the business for information like that for over 25 years. You should also understand that your car most likely has an amplifier mounted in the trunk that is fed by the head unit. Installing an aftermarket head unit is not simple plug and play on E39's with the trunk mounted amp. You are probably best off installing a head unit with 4 or 5 volt preamp outputs or using an OEM interface adapter to pad down the speaker level outputs on the Pioneer head unit. The factory amp expects to see a signal of around 5-6 volts rms at its input for full volume.
Originally Posted by edjack
Talk to the suppliers.
When I upgrade my system this spring, I am going to replace the factory amp with a higher quality aftermarket unit. I am also replacing the door speakers and installing a small subwoofer. I will keep the factory MID head unit and use a GROM Audio adapter to get USB, Android and iPod interfaces.
Last edited by mda185; 01-20-2013 at 08:57 PM.