how to;? enlarge inside a35 intake

jamie papp /
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how can i maximize the inside of my stock intake manifold for my tomos a35 engine with an airsal 67cc kit, techno estoril pipe, and otherwise stock pipe i am planning on running the smallest phbg carb they make i think its either 17mm or 19mm not sure which would benefit me the most, anyways i'd like to know how much i can bore out the i.d. before it becomes a paper weight, thanx or tricks and tips for them to flow more air etc. thanx all!

-Jamie Papp-

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