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Since the NFL went to a 16-game schedule in 1978 only 6 teams have finished the regular season with a record of 15-1 or better. Of those 6 teams only two of those have won the Superbowl:

1984 - San Francisco 15-1 = won Superbowl 38-16 over Miami
1985 - Chicago 15-1 = won Superbowl 46-10 over New England
1998 - Minnesota 15-1 = lost NFC Championship 30-27 OT to Atlanta
2004 - Pittsburgh 15-1 = lost AFC Championship 41-27 to New England
2007 - New England 16-0 = lost Superbowl 17-14 to NY Giants
2011 - Green Bay 15-1 = lost NFC Divisional 37-20 to NY Giants