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The dips in torque and hp may be caused by a valve controlled variable intake, which Toyota uses in many of their engines. What I mean is, by way of a valve, the intake length is effectively changed. All of the dyno charts I have seen from engines that use this type of variable intake suffer from significant dips in torque and slight dips in hp near the switchover point. Some (all?) lexus motors use three stage intakes to better avoid these dips.
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Nothing decays like progress, and nothing preserves like neglect.
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