I put in an aftermarket stereo with USB and SD slots. I used the "Metra" brand adapter harness with door chimes to keep everything working right. The clock and date don't appear on the HUD anymore, but the aftermarket radio has the time on it.
The original radio has been sitting around for a few months and I'll be happy to sell it cheap. If you're interested make me an offer by PM or posting here. It's listed on Chicago area Craigslist with the link below.
Pontiac Grand Prix 2004-2008 stereo system