I am confused as to what cable I would need to get VAGCOM working on my A3 Sportback. I know the 8P/Golf V platform has the CAN bus, but does that mean that you always need the (expensive!) cable from Ross-Tech or do most things also work over the old fashioned K lines? I can get a dual K-line ODB USB adapter for a reasonable price, but is it going to work on my Sportback? Also, does anybody know which functions/modules use the CAN bus and which use the K lines?