Ooooh yeeaah! Time for aftermarket cams perhaps....
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RM-M22xx or bust
If your still running the DC Header I would use M22x and not the XX
What pistons are you running and with what compression ratio?
I'm planning a rebuild on my b18 now, nothing extreme just bore/hone and head reco. I'm thinking if using p73 usdm pistons which will bump the compression up slightly but keen to see what you used since your results seem pretty good with a near stock build.