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6266 is a larger turbo than the 7163 with a turbine that has a greater swallowing capacity which means less backpressure. Also his "high boost" was only 19psi. There's gonna be a lot more backpressure at 25-30psi.
His pressure ratio (exhaust:intake) was probably close to 1:1 where the N1s operate well since that is basically the ratio of an NA car with a good flowing exhaust. Meanwhile a 7163 at 25psi/8k+ is probably going to be a ratio of 1.5:1, maybe even 2:1 on a 2.2L.
I guess we'll find out if the N1s hold it back when I eventually get back to the dyno. My guess is the P12 cams will make the most power up top with a 7163 at 25psi+ while the N1s will make the most midrange. At ~20psi I'd guess the N1s are the best all over. I need midrange for autox and probably will only run 20-25psi when I compete anyway, so I went for the N1s.
TLDR; Once you hit the point where the backpressure overcomes the momentum of the exhaust and you see reversion, the P12s should make more power than the N1s due to less overlap.
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