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And for the ones that questioning the result, when Subaru designed this engine the throttle body diameter was expanded from 60mm to 65mm. This is a difference of 5mm. In contrast, intake valve diameter was expanded from 34mm to 35mm and exhaust valve diameter was expanded from 28mm to 29mm. Only 1mm. This is another indication that there were more gains from the throttle body change.
Was this 5mm increase enough? According to Toda Racing it was not and there was the potential of a few more gains with a +2mm increase. In fact Toda Racing provided a larger TB back in 2012 and it was one of their first products for our engines.
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