I had posted a question under EFI because my bike wasn't idling after the install of the new plenum. I'd incorporated the design feature of filterd air intake for the IAC. The consensus was I needed a 1/4 x 1/4 passage from each throttle bore to the pintle valve area. I can report that that is the case. I hogged mine out & it works great again, I'd had insufficient volume. Thanks to all you guys who chimed in !