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the idea behind the vvt on the civic vx is to keep half the intake valves closed at lower rpm, so that intake port is not being used, toyota does this by adding a butterfly valve to the intake port in the intake manifold to close off that runner, as long as your head doesn't combine the intake ports inside of the head you could retrofit this to your current engine with just a new intake manifold and there are a fair number of people out there who have made their own intake manifolds so they could add after market carburators to engines that were fuel injected, or independent throttle bodies, all kinds of stuff like that.
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