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Before we delve into our top 20, here are some of the most rowdy stadiums from outside the FBS.

Division III: St. John's University

For love of the game. Division III players go to school not to play football, but to get an education. Heck, these guys don't even get scholarships!

For a stadium that holds under 8,000 fans, Clemens Stadium is still an amped up place on Saturdays. The stadium is full of excitement and has even been recognized by Sports Illustrated in 1999 for its unmatched atmosphere.

Division II: Grand Valley State University

It wasn't all that long ago that Grand Valley State was a relative unknown, even in Division II. But a guy by the name of Brian Kelly changed all that.

Since the time Kelly became coach in 1991, GVSU has expanded Lubbers Stadium from a paltry few thousand seats to nearly 11,000 for 2012. The record attendance is 16,467—which was 93 percent above its seating capacity at the time in 2009.

The die-hard fans at this university of 25,000 students have created one of the loudest stadiums in Division II and have spurred their team on to four national championships since 2002. With the student section perched mere feet from the field of play, it's no wonder the Lakers are 76-4 at home since 2000.

FCS: Montana

For an FCS program, 25,203 is a pretty big stadium. It's even bigger than a few FBS stadiums. Washington-Grizzly Stadium is also home to the best non-FBS game day atmosphere anywhere in the country.

With so many fans so close to the field, there's no other lower-division venue like it. Opposing teams have learned that the hard way, as the Grizzlies have reached the national championship game seven times since 1995.