NEW ORLEANS — Utah is the best of the BCS busters.

Brian Johnson threw for 336 yards and three touchdowns, and the No. 7 Utes upset fourth-ranked Alabama 31-17 in the Sugar Bowl tonight to finish 13-0.

With the victory, Utah became the first team from a non-BCS conference to win two BCS bowls. The Utes beat Pittsburgh in the 2005 Fiesta Bowl under coach Urban Meyer, going for his second BCS national title with Florida when his Gators play Oklahoma on Thursday in Miami.

Johnson's pinpoint passing led Utah to a 21-0 first-quarter lead and the Utes refused to wilt when Alabama pulled to 21-17 early in the second half.

Utah's defense was equally impressive, intercepting John Parker Wilson twice and sacking him eight times, with the seventh sack forcing a fumble that sent crimson-clad Alabama fans streaming for the exits with just more than five minutes to go.

After surging to No. 1 in the rankings with a 12-0 regular season, Alabama closed the season with two consecutive losses, the first against Florida in the Southeastern Conference championship game.

Alabama could have used suspended All-America left tackle Andre Smith, but even he might not have been enough to stop a Utah defense that played with speed, ferocity and discipline.

The Utes' front seven was significantly outweighed by Alabama's offensive line, but refused to give ground to the Tide's normally powerful running game that averaged 196.5 yards per game coming into the Sugar Bowl. Glen Coffee was held to 36 yards on 13 carries, while Mark Ingram rushed eight times for only 26 yards.

The Utes' array of stunts and blitzes appeared to upset Wilson's rhythm. He overthrew a couple of open receivers downfield and finished 18-of-30 for 177 yards and a touchdown

Utah didn't seem very interested in running the ball, and who could blame them the way Johnson adeptly spread the ball around to seven receivers? He hit Freddie Brown 12 times for 125 yards.

Johnson was 27-of-41 and was not intercepted. His touchdowns went for 7 yards to Brent Casteel, 18 yards to Bradon Godfrey and 28 yards to David Reed. Matt Asiata ran for a 2-yard TD, a score set up by Reed's leaping catch at the 2.

An Alabama comeback appeared to be building early in the second half, when Dont'a Hightower stripped Johnson and Bobby Greenwood recovered at the Utah 30. Wilson methodically drove the Tide for a score, hitting Coffee for an easy 4-yard score on a rollout to close the gap to 21-17.

At the point, Alabama had scored 17 straight points, and it appeared to be only a matter of time before the Tide, favored by more than a touchdown, would overtake the underdog Utes.

Johnson had other ideas, opening Utah's next drive with a 33-yard pass over the middle to Brown. The completion kick-started a 71-yard scoring drive that ended with Reed's touchdown.

The Tide drove right back into Utah territory, but Ingram was stuffed for no gain on third-and-2 from the Utah 32. Leigh Tiffen then missed his second long field goal of the game, hooking a 49-yarder just left of the upright.

Only a year ago, the Sugar Bowl saw its first BCS buster in Hawaii, which took a 41-10 beating from Georgia.

Utah calmly dismissed any comparisons to last year's game during the lead-up to the game, and wasted no time proving it on the field.

The Utes stalled Alabama's game-opening drive by blitzing linebacker Stevenson Sylvester from the side vacated by the suspended Smith, resulting in a jarring sack from Wilson's blind side.

Johnson then completed his first five passes for a combined 68 yards, the last his TD pass to Casteel.

The heavily outnumbered Utah fans had barely stopped cheering the TD when safety Robert Johnson intercepted Wilson in Alabama territory and returned it to the 32. Two plays later, Reed made a leaping, 30-yard catch along the sideline, setting up Asiata's plunge through the line for a 14-0 Utah lead with more than 8 minutes remaining in the opening quarter.

Tide coach Nick Saban was pacing and grimacing already— and things were about to get even worse. Replacement left tackle Mike Johnson limped off the field on Alabama's next series, forcing the Tide to move tackle Drew Davis to the left side and insert freshman lineman John Michael Boswell on the right. Soon after, Wilson was hurried into an incompletion, then sacked on the next play, forcing another punt.

Utah's 21-0 lead, the largest deficit the Tide faced all season, stood until Tiffin hit a 52-yard field goal on the first play of the second quarter. Alabama did not score an offensive TD in the half, but pulled to 21-10 when Javier Arenas returned a punt 73-yards for a score, bursting through three tacklers before breaking outside and outrunning the rest.