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By not altering the valves opening with the cylinders being deactivated you are going to screw up the ratio the exhaust gasses being fed through the catalytic converter. This device would lead to operating in a permanent lean mode from the catalytic converters point of view. A large number of catalytic converters need alternating cycles of lean and rich mixtures to operate correctly and avoid fowling. (Note some o2 sensors have their lifespan reduced by operating in excessive lean conditions for an extended period of time as well).
How do you intend to address this and still be able to pass an emissions check?
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