The EPA isn't terribly worried about emissions test results, and also the standards are different between states and even counties.
But for that small amount of time your car is in lean burn mode, the EPA is worried about that...
Strangely enough, CVCC's design actually reduced emissions compared to the conventional head design, and allowed Honda to go with out a Cat-converter for many years.
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Lets see how far it can go
"All I know about music is that not many people ever really hear it. [...] But the man who creates the music is hearing something else, is dealing with the roar rising from the void and imposing order on it as it hits the air. What is evoked in him, then, is of another order, more terrible because it has no words, and triumphant, too, for the same reason. And his triumph, when he triumphs, is ours." -Sonny's Blues
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