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Message: <blockquote data-quote="J101" data-source="post: 1391534" data-attributes="member: 15660">62mm is ONLY for ITR. By all means 96,97,98,99 or 00 spec ITRs. That is why SPOON took the ITR ones for their so-called SPOON TB. A big size to start with. They cant be taking some EF9 ones rite and start to bore from 58mm and mill to 64mm rite?If your butterfly is right in the middle and you bore both ID and OD bigger than the butterfly, its gonna be a choking process and bottleneck isnt it? Then you have to custom a new butterfly that inccurs cost to it. Say, u want an OD/ID/Butterfly match to 68mm. Dont forget, the intakemanifold has to be 68 also.Forget about the venturi system. What you want is more air. I know the venturi system increases air velocity but when you need that "too much" air, it chokes at the high rpm. That is why you dont seen venturi plates for sale nowadays. Its good for short distance track. They just want the burst power everytime track cars comes out from a corner.If you plan to have best in everything then its gonna be a problem my friend. Let me guess, u want to have a big OD and ID without changing the butterfly YET having a venturi system effect? :p ps. im running on stock 60mm TB, when im dead bored then i run my quad throttles alternatively.</blockquote>

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