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According to Rob, the C2 cams are similar in performance to the S3 but I think the C2 will breath better at the top end. With the C series cams you much use the JWT valve springs and ti valve spring retainers.
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What about the S4 cams then? are they more aggressive then the S3?
and would they be alright on a AT Primera? as in....would there be enough low end power and torque to even move the car?
or/and too much high end power that it could possibly kill the gear box at high rev?
and would the power gain from changing cams more significant then changing the header?