This broke via Wired today:

ISTANBUL, Turkey — The Turks, who love football as much as anyone, have the loudest fans on earth.

The 51,998 people packed into Turk Telekon Arena, home to the Galatasaray football club, let out a 131.76-decibel roar during a match against Fenerbahçe two years ago, enough to secure a spot in the Guinness book of records. That’s louder than The Who during their 126-decibel gig in London in 1976, and louder even than standing behind a fighter jet at takeoff.

They haven’t gotten any quieter.

They’ve posted a nifty little video on the site as well.