I'm a die hard XM radio guy and I really want to get XM put in the dash of my 07 mazda 3i. The dealer is no help(because they're only pushing Sirius), and both best buy and circuit city stores I called haven't had experience doing this. Currently I'm using my portable XM in the car, but its a pain to have the wires/antennae all over the place. Anyone know if its possible to install XM in my car? Thanks.