Hey I'm 24 and my name is Neish' I never owned a cadillac before in my life but my father has had many over the years. I purchased a used '05 Cadillac STS 3.6L V6. No navigation and sun roof, but I got an amazing deal. Plus after getting the car checked out at the cadillac dealership it was in awesome condition so I bought it even without the "deal breakers" lol. My question is now what can I expect? Is it possible to just buy a navigation system for the 2005 sts on ebay and install with an antenna? Or just buy an aftermarket head unit with navigation? Is the 3.6L V6 better than the northstar V8 engine? I noticed my push to start works but the remote start dose not work. I replaced the battery and still nothing. Anything you'd like to recommend? I'm open to suggestions and just any general knowledge anyone may have to offer in regards to this particular vehicle. Thanks in advance, looking forward from hearing from you all.