Well the rev limiter kicks in at 8k rpm. I don't think you'll hurt the engine by revving to there, since the rev limiter won't let you rev past that point. Isn't the whole point of the rev limiter so you won't rev past a point where you can hurt your engine? That's what I thought. I like revving to 8k rpm. It makes me feel good
I think the only problem with revving to 8k rpm is that you can't powershift if your racing someone.