Just a quick question for those familiar with the weight:hp classes and modification factors in ST1/ST2/ST3; I can't find the answer to my question in the NASA rules. (It may be so straightforward that no explanation should be necessary!)

These classes fall into the 5.50:1, 8:1 and 9:1 weight to power groups. If modifications increase or decrease these ratios to give a competitor his final "score," what is the implication of that? I can't find ballast penalties to equalize, as in the Challenge series. Is it just that one's final car prep leaves him with a modified ratio, and that, if he is beneath the breakpoint between classes, he must go to the next class and is otherwise OK?

Thanks for any help.

Bill