Im sure this has been asked so im sorry.. but...

i just got my z1 (didnt install it yet), my jeep has sirius installed from the factory, am i going to have to buy the pioneer sirius box? or can i use my factory sirius??????

You're going to have to get the pioneer sirius tuner. There is no interface that ill allow you to use the factory tuner with an aftermarket radio.

You might be able to use the factory Sirius antenna, though. Depends on if the tuner has a single or dual plug antenna.