GrandTheftA6to

My 2003 A6 4.2 does not have the satellite radio option. Recently, I had the RNS-E installed with some modification. Even though the car has the navigation roof antenna, I was able to have the roof antenna bypassed. I am sure some of you are familiar with this modification with an antenna mounted behind the instrument cluster. It got me wondering. I have found the Kufatec retrofit package, which requires the satellite (shark fin) antenna. Has anyone bypassed the shark fin antenna with a generic Sirius satellite antenna? Check the links below. Would this require some custom wiring or would this not even work? Any advice would be greatly appreciated. Thanks!

http://www.kufatec.com/index.php?main_page=product_info&cPath=6_18&produc ts_id=543

http://www.bestbuy.com/site/SiriusXM+-+Connect+Satellite+Radio+Vehicle+Tuner/4910475.p;jsessionid=C82749D87A311A25AC6E7353DA538 2B6.bbolsp-app06-43?id=1218577512632&skuId=4910475