i have the upgraded stereo in my 08 tcion, what do i need to get to get sattelitte radio

 

Is it the stock radio, pioneer xmradio ready, or an aftermarket radio? You will need the tuner if its a stock radio, cost me around 200 dollars shipped from xmfan. Install is not too bad if you want to put the antenna in the stock location, just a little time consuming since you have to remove a rear seat and some sidewall trim.

 

These are the part numbers for the receiver/fit kit I used in my '08 (also with the upgraded stereo). This is for a Sirius installation.
PTS31-00051-AA Sirius Fit Kit
PTS31-53060 Sirius Reciever
I ordered both of these from TRD Sparks. It's not the cheapest alternative for sat radio, but it is oem integrated and uses the head unit. The install isn't too hard, either.