did the c5 ever come from the factory with an xm radio receiver? I have a 2000 and would like to install a factory unit if possible. If not is there anyone out here that has xm and what brand do you use.

To the best of my knowledge,the C5's didn't come with an XM radio factory installed in the car.I purchased one and installed it myself.Real easy to do. I purchased mine at Best Buy.Very reasonable and worth every penny.