The 07 GS350 I bought has the ML stereo with the SAT button. When I press it nothing happens so I know I need the tuner. I searched around here and found a thread talking about an OEM XM kit that gets installed in the trunk and the radio doesn't have to come out. I have a few radio's activated with Sirius so it would be way cheaper to activate another Sirius radio on the car. Is there an OEM Sirius kit that installs in the trunk that can also use my existing shark fin antenna? I want it to look as factory as possible if I can.

 

Check out vaistech.com I used the sirius sat module in my 06 gs. I don't have the shark fin so I had to install an antenna but I think they sell the adapter that would work with the fin.