I am looking at a 2010 S40 for my new family driver, but I was hoping for satellite radio in car. I do not believe the car I am considering came with satellite, but I see 2010 S40 Sirius satellite units on eBay and other sites. I am out of my league here; is it technically feasible to buy a compatible S40 Sirius unit and install and use with existing AM/FM/CD/HD unit in car? Is there more to both what I need to buy as well as ease/cost to install?

thank you for thoughts