The International Hot Rod Association (IHRA) has released its 2025 rulebook for professional classes, Pro-Am, and ET bracket series competition.
The rules are now available at ONLINE RULEBOOK, and racers can register through the organization’s membership portal to compete in the upcoming season.
The IHRA Outlaw Nitro Series returns with a full schedule and what officials describe as a “powerhouse lineup.” Highlighting the tour is the $125,000-to-win IHRA Outlaw Pro Mod Nationals, which pays homage to the former Nitrous Nationals event.
In addition, the IHRA SuperSeries continues its bracket racing championship.


