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Maybe the HC filter is the missing piece Toyota needed to get the Tundra certified as a ULEV vehicle. How much pollution can possible result from not having this filter? If you think about it, the moment you turn off the engine, the fuel injectors shut off immediately but the engine will rotate a few turns sucking in the rest of the intake air. So with that scenario there can't be much of a gas contaminated charge left in the intake runners, not to mention the throttle body is shut as well further trapping everything. California regulations really sour it for us in terms of legally modding vehicles.