if your speaking of class racing, then you needthe rules in the class dictate whether or not it can be used.
As far as the NHRA is concerned, I believe mine is the only system accepted for Sportsman. But Sportsman is a wide range.. and encompasses everything..thats not a class. IE, Pro Stock, Comp, etc..
Guess you need clarification on power adder for your class.
Example, the Hot Rod pump gas drags didnt allow anything that was above water injection. No alcohol of any kind allowed. Make sense?