Recently bought a 07 MSP Sport and want to have my sat radio. I see the Mazda unit is $350 which seems like a lot. On the Sirius website is a tuner (SC-C1) that lists for $49.99. Anyone know if this tuner will work with the stock HU and keep the controls from the steering wheel? Also, can the sat antenna be routed through the stock unit? I dont want to have another antenna outside if I dont have to.