Removed this (with care) from the wifes E90 320 as she has an iphone so its not used.

Full hard wired hands free kit that operates through the multi function steering wheel.

Clips over the centre console so no holes required.

Very very easy to fit, just remove stereo and unplug, switch two wires and then plug in back through adaptor.
Mutes radio when phone rings and uses the car speakers.
This also has Bluetooth capabilities.

Looking for £70 + postage