Quote:
Originally Posted by robnitro
I don't think it's so much to do with the runner length but the angle that the air comes to the valves to induce swirl at lower air flow (low rpm).
It's for emissions primarily but may affect low end torque but I didn't notice a difference in low end power or mpg when I deleted my flaps.
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Correct. The only reason they are there is for emissions. They close at idle and create a swirl in the combustion chamber which reduces NOx emissions.