I have an 08 Mazda 3. It currently has a Sirius/XM radio setup. I was told that, in order to use the factory installed auxiliary port in the center console, I would need to install a $300+ splitter to have both the port and the satellite radio. Is there any way that I could get this splitter through a OEM parts dealer? I'm certain that I can install this thing myself, and perhaps save the money in having the dealer do the labor. Anyone know what part it is that I'm looking for?