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I would assume the measurement of the opening is measured at the butterfly. Since this portion of the opening is not ported, I don't think it is a measurement that means anything. The portion of the TB between the butterfly and the intake tube is the portion that is ported and by the looks of the video, I would guess 1-2 mm of material is removed. More importantly it is done on a CNC and is consistent and perfect every time. Good throttle response, no HP gain. I would think if you port the snout, S/C and heads you would really have some good flow and throttle response.
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Roto-Fab CAI, ARH LT, SW 3" catback, JRE tune, Elite-2 CC, VMAX TB, Big Gulp, WW II relo, Lingenfelter S/C reservoir
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