Is this what I need to hook up an aftermarket subwoofer/amp to my stock boss HU?

http://cgi.ebay.com/PAC-AOEM-NIS2-19...QQcmdZViewItem

sorry for the noob question but I don't know car audio very well, I checked the stickies but I found them to be really confusing but I think this is what I got out of it, thanks guys.

 

You dont need any of those expensive modules. You can either splice RCA's into the stock speaker wire directly behind the head unit, or add a high-low converter (converts speaker wire to rca cable) at the stock Bose amp.

 

should I still get an amp or can I use the boss amp? Where is the boss amp located?