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The fine folks at Cold, Hard Football Facts do very good work, and I've been guilty of looking at it too infrequently.
Just came across these notes from them on pass defense:
INDIANAPOLIS - The Colts still allow that amazingly miniscule four TD passes for the season, after keeping the Browns out of the end zone (by any method) back on Sunday. As noted several times this year, the modern record for TD passes allowed is five, by the world-champion 1973 Dolphins in a 14-game season. Indy's ability to keep opposing passers out of the end zone here in the Golden Age of the Passing Game is nothing less than one of the statistical stories of the 21st century.
TENNESSEE - The Titans led the league in Defensive Passer Rating for much of the year before being surpassed recently by the Ravens. Still, their better than 2-to-1 INT-to-TD ratio is rare in this day and age and surpassed this season only by Indy's historic pass-defense streak (noted above).
For CHFF's full look at defensive passer rating and some other quality notes that fall outside the AFC South, head here.