The Kansas City Chiefs, Green Bay Packers, and San Francisco 49ers each at 13-3.
The Tennessee Titans went 13 & 3.
The team with the best regular season record in 2004 was the Pittsburgh Steelers at 15-1.
The 1972 Miami Dolphins went undefeated both post and regular season but back then only played a 14-game NFL season The 2007 New England Patriots went 16-0 and are the only team to go undefeated in a...
the 07-08 Patriots went 16-0 but lost the super bowl to the Giants
2009? Broncos Colts Giants Vikings Saints all have 4-0 record