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Originally Posted by black s13
the butterflys are to increase low end torque. restriction generaly increases torque, as in stock air box vs. short ram. the butterflys close at low rpms, restricting the airflow, raising torque, and open at higher rpms, for better top end. a few honda motors has them as well, B18C's do i know for sure.
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Is there anyway to replace them or machine them for higher flow? Ya know like high flow TB plates?