The OEM's are sqeezing more and more power & thermal efficiency out of these motors. From the factory many of these cars are actually tuned quite close to the edge considering how detuned OE's used to deliver their cars.
The two dyno's I'm talking about are the only two dyno's I've seen of the 370z. One from Z1, which is a 100% bone stock car, it's showing knock response right around 4250rpm. Second, is GTM's dyno of their test pipes. Their test pipes showed good gains at ~12rwhp, but with looks like knock response @ 5500rpm.
Don't know where the talk of forced induction came in though.... these cars are both NA.
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