Only a handful of STI's flying. All the ones I know of are running more HP than 100. Only one that I know of running a 100hp rotax is John Moriarty, who just sent his engine off to get boosted! He should have some good numbers for you as he flew his with the 100hp rotax for a bit before. Down at sea level 100hp should perform well. From what I gathered I think the STI wing is about 40lbs heavier than the 7ss.