you can buy this and it will work just like your xm does. it plugs in at the xm tuner plug and replaces it. im some cases you can use the xm antenna too. i know you cant in an acura tl. the sirius kit is a honda adapter harness (part # HON-SC1) and a universal sirius tuner box (part # SCC1). if the antenna doesnt connect, they make an adapter for that too (part # HONXM1SIRIUS). it displays the info just like the xm does. we install these at work and havent had any issues yet.
sirius tuner kit