Boise State has rolled through Mountain West play since a loss to BYU in the final minute of regulation. The 21st-ranked Broncos have outscored their four opponents 204-24 since the loss, and that has coach Bryan Harsin feeling wary.

Boise State (5-1, 2-0 Mountain West) plays at Utah State on Friday, and Harsin knows the recent offensive explosions won't happen so easily. The Aggies (3-2, 2-0), have the No. 2 scoring defense in the conference and are allowing just 19.2 points per game. The run defense is also No. 2, giving up 102.2 yards per game.

"They'll challenge you. ... They're trying to attack," Harsin said. "That's a mind-set."

The Broncos have the top passing offense in the Mountain West, led by freshman Brett Rypien. That, however, puts a premium on protection, and Boise State expects the Aggies to bring plenty of pressure from a unit that has eight sacks in the past two games. Harsin specifically mentioned linebacker Kyler Fackrell, who had a two sacks last game.

"He might be one of the best college football players out there," Harsin said. "That guy is very good. We've got a huge challenge to try to block him and contain him."

Utah State is trying to hold on to a share of the Mountain West Mountain Division lead. The Aggies, Broncos and Air Force are all tied with 2-0 conference records. Boise State, though, has won 12 straight against Utah State.

"It's not the championship game, but it's a big game and basically puts the winner in the driver's seat," Utah State coach Matt Wells said. "That's why it's important, no question. We're excited for the challenge."

Friday's games

Peyton Barber rushed for two touchdowns, helping Auburn beat host Kentucky 30-27.

Brandon Doughty passed for 350 yards and four touchdowns, lifting visiting Western Kentucky over North Texas 55-28.

Etc.

•North Carolina cornerbacks M.J. Stewart and Mike Hughes were suspended indefinitely for a violation of team rules, sidelining them for Saturday's game against Wake Forest. Stewart is a starter, Hughes a reserve getting regular playing time.