Just bought 2010 Mini Clubman; can we retrofit with Sirius?

[MTD22015]

We got EXACTLY the car my wife wanted, EXCEPT no Sirius. The guys at the dealership have been a bit vague about retrofitting it for Sirius, and the guys who did my other three Sirius installs at a regular car sound place say they advise us to have the dealer handle it.

Is there any particular reason why this should be a problem?

Any help appreciated,

MTD

[bad venge]

I bought a unit and plugged it into the auxillary input on the head unit and the Antenna under the passenger seat