this is how i used to roll our gutted b13
u just need a amp and a rca to headphone jack cable
use the ipod or mp3 player for volume
u can hook it to your stock speakers, or do a whole system or whatever u want
i just had 2 6x9's in boxes i threw behind the seats lol
just plug the cable into the hadphone jack on the mp3 player and the rca's into the amp, turn the volume up almost all the way on the mp3 player and adjust the gain on the amp to where its as loud as u want it but not blowing speakers, then just turn it down on the mp3 player
easy as pie!