ur going to have problems smogging ur car with any intake system for the tc because non of them are smog legal. the stock intake box has a built in carbon trap on the top piece that aftermarket intake cannot replicate and therefore it is never going to be legal. the bypass valve connects between the two seperate pieces of intake piping of a cai to prevent hydrolocking the engine in case of water being sucked up by the intake. hydrolocking is when an engine seizes up and doesn't run anymore because water has be ingested into it from the intake manifold.
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