I read through this thread about adding the AAI-NIS.
AAI-NIS

I'm probably an idiot, but I need some clarification. In order to add a sirius tuner (Sportster for instance), I'll need the PAC AAI-NIS, right? I was at a circuit city and their install team told me they could connect the unit directly to my head unit w/out using an FM transmitter.

I'm thinking they have NO idea about our head unit and are assuming there's an aux input they can use. But they got me second guessing myself. If my RF unit's pre-wired for satellite, does that mean it's only pre-wired for the factory unit..NOT an aftermarket tuner like the sportster?

Hope this makes sense. I'm sure it's been discussed before, but I just can't figure it out for myself.