As long as you have the Rockford Fosgate headunit, this is a monkey-easy install.

Obviously, you need to buy the PAC AAI-NIS adapter.(Just Google it, and you'll find any number of vendors willing to sell it to you. Cost me about 70 bucks.) From there all you need to do is open up the dash, get behind the HU and shove the adapter plugs in the back of the HU. If you need instructions, they're included, but this is really as simple as plugging in.

The AAI-NIS has two sets of RCA jacks on it, so you get two aux inputs. Just get an RCA to 3.5mm cable (you can get these anywhere from Radio Shack to Walmart) and run that from the adapter to somewhere outside the dash. I have mine run to the little tray underneath the VDC button panel.

Selecting the aux input is controlled through the HU, making for a nicely integrated package.

If you need help pulling out the dash panel, I know there's a post somewhere on this board showing how to do that. It's very simple.

Before getting the AAI-NIS, I had a hardwired FM modulator installed to get the aux input, and let me tell you; it can't hold a candle to the sound quality of a direct connection. It's a HUGE improvement. I have an XM Roady2 and my Ipod hooked up, and I couldn't be happier.