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the ID but keeping the OD the same. I'm not sure of the increased performance numbers, but if you send him your aftermarket ICs (especially Stillen), he'll send them back to you with a larger ID, where a big cork in the system is....I don't know the difference in the before and after dimensions, but he claims the performance gains are significant. Call him at JWT and find out more info. I don't know how much Ash's performance gains are from his increased dimensions on the face and surface area, and how much is due to the increase in the inlet and outlet dimensions. But good work, none-the-less. Take care, Mark
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