Peyton Manning is playing at an elite level, surprising everyone by playing his best football after multiple neck surgeries. Having an elite quarterback is the main attribute of a Super Bowl winning team and the Broncos have that in Manning.
The defense has also gone from average to one of the best in the league. This has a lot to do with Von Miller, who had three sacks in the win against San Diego. Miller isn't the only one making a difference though. Elvis Dumervil and the secondary are providing great pressure and coverage, making it hard for the opposing offense to make a play.
Although the Broncos are set to win the AFC West, there are still a few things they can improve on in order to win the next big title: Super Bowl Champions.