Watch SLIPKNOT Perform In Austin

Fan-filmed video footage of SLIPKNOT's August 27 performance at the Austin360 Amphitheater at Circuit of The Americas in Austin, Texas can be seen below.

SLIPKNOT will perform its 2001 album "Iowa" in its entirety at Ozzfest Meets Knotfest on Sunday, September 25 at San Manuel Amphitheater in San Bernardino, California.

"Iowa" came out in August 2001 and followed up SLIPKNOT's double-platinum 1999 major label debut.

Still considered their heaviest and darkest effort to date, the disc was made during a difficult period in the band's career. Percussionist Shawn "Clown" Crahan told The Pulse Of Radio that the chaos surrounding "Iowa" is what made it so intense. "The whole thing, from the beginning — it wasn't a disaster, it was exactly what we wanted to do," he said. "It's where we all wanted to be. We all made a conscious decision to dive headfirst into this thought process known as 'Iowa', and it was a very painful, disgusting, evil, angry, hateful, self-indulgent monster."

"Iowa" has sold more than one million copies and featured the songs "Left Behind", "The Heretic Anthem", "My Plague", "Disasterpiece" and others.

Singer Corey Taylor told Metal Hammer about the album: "Our whole goal was to go in and make this dense, destructive album. We had no idea how destructive it was going to be. You can hear the bile in it, you can hear the frenetic passion for what we were trying to do."

SLIPKNOT was forced to postpone its North American trek with MARILYN MANSON by three weeks after Taylor underwent what he described as "an unplanned spinal surgery."

The summer trek is likely to be SLIPKNOT's last U.S. tour in support of its latest album, ".5: The Gray Chapter", which was released in October 2014.