Hi, new guy here but I have 4 Subbies. My latest is a 2014 WRX Base Wagon. The WRX has XM on the face of the radio, and an XM cable that runs from the radio area to the driver pillar. But that's where it stops. Does anyone know if Subaru pre-wires the XM overhead? What I mean is there a wire up there for XM. I see the AM/FM wire running up the pillar and the green XM female connector but know cable. I am just trying to avoid running another XM cable to the outside with another antenna... I don't really mind running another, but it would be neater to use the existing antenna but I fear it is not XM capable......... :/