Does anyone know if it is possible to use the stock satellite antenna for Sirius with a F900BT and a 2008 VW GTI? If so, are there any DIY's or instructions on how to do this? Thanks.

most likely all you will need to do is remove the plastic connector and use a dab of hot glue on the connector on the new tuner

I was talking to a stereo guy today and he said it's possible and if done correctly reversible as well. You will have to buy a pioneer compatible sirius tunner though. think it's SCC1

Do you know where I could find instructions on how to do this?

Honestly just dig into it, it's really straight forward once you have the two tuners in your hands and can see the difference between the plugs.

you can tap into the oem sharkfin antenna.

above your rear windshield pull off the trim piece.

there should be 4 fakra connectors:

Blue= gps

red/pink = GSM/Cellphone/Onstar/Telematics

white = sat tuner either xm or sirius(satallite signal)

black = sat tuner either xm or sirius (terrestrial)

the dealer part numbers are measured in meters for length, it is an fakra extension wire:

1M = 000-098-652

2M = 000-098-653

3M = 000-098-654

4M = 000-098-655

5M = 000-098-656

6M = 000-098-657

7M = 000-098-658

the fakra should fit into the sat tuner, if not u can pull it off with a flat head or get a smb connector for the end and plug it in.... i am working on getting the d3 to work with my sharkfin. i will post if/how i got it to work.

Just put the tuner under the passenger seat where the stock sat radio tuner was located. There is even power and such you can tap into there. Its really easy to do, what took me the longest in my rabbit was running the IP-Bus cable behind the glove compartment down the kick panel and under the carpet to the tuner.