Doesn't give any gains. It is myth brought over by the carburetor days. Think about it, what good would adding an inch space between tb and plenum? Does adding more length before the tb help? hehe
I loved my plenum/tb combo from accufab. Even when i supercharged i stuck with accufab (went from 70mm to 75mm then finally to big oval). I actually have 75mm for sale... but no plenum to go with it.
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