what size straight trumpets would be needed for the correct induction length of my vts on throttle bodies?
Trumpet size
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#1
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#2im not sure tbh mate, t/b's aren't one of my stronger points, im pretty sure they start at about 40mm and range through to about 70mm so quite a big range, best bet is to contact someone like GMC they will be able to tell you!
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#3correct size for what?
a longer induction tract helps keep better midrange.