i was thinking the same, its not like that car falls on its face after 5200 and if you shifted there you would be low in rpms coming into next gear, you wouldn't be in your power band at all. i understand though that for dyno runs it is ok because you get an idea but also you don't see your af or anything after that so you don't really know whats going on after 5200 to your redline. im sure it is fine but would be nice to see