But saying that it is guaranteed to blow up over 8 psi is just ignorant. I have an open deck and run 8 psi daily driven with shitty engine management and 10:1 CR and I have yet to detonate or even come close to blowing my motor. A closed deck Prelude's only fault is the ring lands. If you can get a conservative tune, a higher compression motor that is built will handle 20 psi as long as detonation is nonexistent and it will beat the shit out of a 8.5:1 running 30 psi.