currently I own a 1999 accord LX and have a kenwood headunit and sirius tunerbox and anntennae.. and I want to trade the car in (sell it) and get a 2006 civic Si. but my problem is.. how can I get sirius satelite radio in the civic using the stock headunit, and XM controls that the car comes with? is there an adapter so i can use my kenwood tuner box do I have to get another unit? or should I just screw it and get one of the add-on units and use the AUX input on the stock headunit? I don't want to use the FM transmitter type, and I want to avoid an external unit if possible. thanks.