Our home track is IHRA and my car meets all of the requirements to run the speeds and et that I do. However if I travel to an NHRA track then I am no longer legal. I race mainly Super Street/ Hot Rod so I have a throttle stop. If I am at a NHRA track I set it up to run legal both et and mph. This sport is expensive enough never mind having to have duel memberships and have the car certified every two years in two sanctioning bodies.