BYU is 5-37 over the last 30 years on the road vs. teams that win 9 games or more. Boise has won 9 games or more in 18 out of the last 20 seasons (probably will be 19 out of the last 21 if we include this year). Boise is probably going to be a loss.

With P5s there are 3 tiers:

Tier 1 1/3 win 9 games or more a year. BYU is 3-36-1 all time vs. 9+ win P5s. There's 2 more losses.
Tier 2 1/3 win 7-8 games a year. BYU is 8-9 at home and 4-8 on the road against such teams. 1-2 more losses here.
Tier 3 1/3 win 6 games or less. BYU is 17-8 at home and 18-14 on the road against such teams. 0-1 more losses here.