Ok so i searched for hours on the forums and found nothing. I have a 08 megacab with infinity 4 speaker system. I bought the navigation dash panel and a install kit from scotsch. I want to install the Pioneer AVIC-3. What else do i need? i want to hook it up and also have serius satellite and the controls working for the steering wheel. i heard from someone that the stock speakers have amps and i have to re-wire them? has anyone installed one of these and have input??

 

I would do a search for "navigation" and you should find your info there. I can tell you it's a lot of work. You have to bypass the factory amp, buy the interface to make the steering wheel controls work, replace all the speakers, buy an aftermarket satellite radio tuner, etc. Might be a job for an installation shop if you don't feel comfortable doing all these things.
Check out avic411.com, there should be a lot of info available.