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Unfortunately in-line engines are generally limited to a fixed intake resonance system, whereas engines with two banks of cylinders are sometimes fitted with variable resonance intake systems.
Mazda's 2.5 V6 as found in the MX-6 has a three stage variable resonance system (VRIS). It uses butterfly 2 butterfly valves which are open and shut at various engine rpm to change the size of the plenum chamber. This has the effect of giving the engine 3 torque peaks instead of one and keeps the whole torque curve higher.
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