So my tach must not be so accurate if the rev limiter should hit before 7000rpm. Also I don't feel any "ka falls flat on it's face after 6000rpm", my motor feels strong all the way to 6800rpm, maybe from the bolt-ons and shaved head.
Anyways, I still wish there was a bolt on centrifugal supercharger kit for the ka24de's. (at least 6psi)