Roger, thanks. I found reliable 92 so it's really just the high flow + catback versus my stock exhaust with open midpipe that's different now, so I'll go ahead and flash that and see how it works out. Appreciate the feedback.

What could I dial back to prevent knock from happening in the first place? I'd prefer to run on the safe side as this isn't a track car.

I have a 40th anni RX-8 with a midpipe, the K&N filter, and BHR coils. I'm curious if I can use the 92 octane tune that's for a similar set up but high-flow cat + catback. I'm using a catless BHR midpipe with stock exhaust, so I'm hoping that it's relatively the same for a tune. 92 octane is als...