Just looking at NFL rankings the Panthers finished as follows in 2013:
Yards per Game: 301.2 (2nd)
Points per Game: 15.1 (2nd)
Sacks: 60 (1st)
Interceptions: 20 (5th)
Rushing Yards per Game: 86.2 (2nd)
Passing Yards per Game: 214.3 (6th)
TDs Allowed: 17 (3rd)
That's a very impressive performance from a defense that was ranked in the 20s most of last season. I don;t think we have ever led the NFL in sacks.
By comparison the only other Panther defenses that might be considered better are the following:
2005 - 5th in points and 3rd in yards
2002 - 5th in points and 2nd in yards
1996 - 2nd in points and 10th in yards
I my view this edges all three of those defenses out and is there without a doubt...