Hi guys

New to the forum, just got myself a 4.4 e53, so far i am loving it but the audio is terrible and outdated.

It has the smaller satnav screen with a cassette. There is a cd changer (doesnt work) in the boot with a navigation cd drive.

I would like to upgrade this to a double din unit with built in sat nav. A quick check on the forum shows this isnt as simple as i had hoped, a quick check in the boot and i cant find a subwoofer amd neither can i see the word dsp on the nav unit.

What is the best way to go about an upgrade, i will be changing the front speaker to a set of components powered by an amplifier.

All help is greatly appreciated