Depends on course, but BRZ/FRS is a capable platform that can toy with the 350Z with identical driver. If you aren't skilled at driving low powered cars, however, you may have some difficulties since power does mask some driver mistakes. The power just makes it easier. For us, the real world experiences speak for themselves. The locals and the track guys know what it's capable of so they have zero negatives to discuss.
The HBP is very effective with the right modifications and sufficient amount of time spent on the dyno. Hope to see more of these out there. PM us if you are interested in putting together a package.