The rev limiter is the safety valve so to speak. I’ve run both my Bs on a dyno. After about 4,500 rpm the hp and torque start falling off. The trick is to make your shift so that when completed you are below that fall off rpm as you advance to the next gear in order to pull through the next gear. Ya hitting the rev limiter on a Preformance “pass” is an eye opener. Hitting it when racing may loose you a race. I’m not riding my bike for the next owner.