Hey all my new ram has stock speaker set up, I was wondering what I would need to do to add the 3 more speakers that come with the infinity system, the 2 tweeters and the center channel that do in the dash.

 

I added subs to my Infinity system. I got a line level converter. You tap off the speaker past the amp behind the glove box. You might be able to tap off the wiring harness off the radio but they are low level and might be enough to drive an amp.