Hi folks, have traded in my 2003 WRX for a 2012 WRX Blue Premium edition. Looking to get rid of the HORRID head unit which doesn't even play BT audio. I've tried searching here and online in other places and can't find anyone who has swapped in an aftermarket HU but retained use of the factory controls on the steering wheels. Anyone know how to do this? I've seen it done in other cars. Imagine its a special harness (if one exists).

Can't cope with the lack of streaming music in 2017....