2005 A4 1.8T Audi Concert Pre-outs?
 

I'm wanting to get a 12 inch sub with a bandpass box in my trunk, but I was wondering if there was any pre-outs already behind the stock audi concert stereo of my car if its a 2005?

If there is not, then what could i do to make this happen without getting a whole new head unit for my car? Thanks a bunch.