Looking to upgrade my 2008 9-3 SportCombi stereo from stock. Everything I've read on here is people installing it themselves. I salute you all for it, but that's not for me. I want to buy the unit and take it to a pro to have them install it. I'd like all the original sounds to work (I really rely on the reverse sonar living in NYC) and the steering wheel controls to as well. Outside of the unit itself, what else do I need to buy to bring to a stereo pro? Also, will any stereo installation be able to do this or do I need to go to a special one who is familiar with Saab and explain things to them? Thank you.