NGK PFR6B's is what were put in my GC8 by mechanics.

I preferred NGK PFR7B's as they helped stop a wide open throttle missfire problem i had. My car was running 24psi through a VF34 with a PowerFC injectors etc etc so it was mildly modified. If that helps.

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Honda Hannspree Edition CBR 600 RR - SOLD
Yamaha FZ1N - Purchased