Sirius SIR-GM1 - anone know anthing about this?

Wife has a 2006 HHR with the factory upgraded radio (Pioneer) and I want to know if this is compatible,

http://www.radioshack.com/product/in...ductId=3714028
tia

The SIR-GM1 connects to factory GM radios using the CD changer connector on the rear of the radio. I would say first see if this connector exists on your Pioneer radio. Should be 12 or 14 pins and square. I don't remember the amount of pins. If it has the socket as described you could order the SIR-GM1 from someone that accepts returns like Amazon and give it a try.