The SIR-POR2 adds Sirius satellite radio to the factory PCM2/2.1 radio in select 2005+ Porsche vehicles with software version 3.0 and up. 

The SIR-AUD 2 adds Sirius Satellite radio to factory radio in select Audi fiber-equipped vechicles. 

The SIR-PCM3 adds Sirius Satellite radio to the factory MOST fiber optic stereo system in select Porsche vehicles.

The SIR-PCM3 adds Sirius Satellite radio to the factory MOST fiber optic stereo system in select Porsche vehicles.

The PCM3 MEDIA kit adds iPod input, USB-Media, Bluetooth and Satellite integration to select Porsche vehicles. 

The PCM3 MEDIA kit adds rear camera, VIM, iPod input, USB-Media, Bluetooth and Satellite integration to select Porsche vehicles. This kit inlcludes an OEM Porsche center-console dock for a factory looking installation.