Quote from: m in sc on September 28, 2025, 10:23:58 PMno motor on here here is going to ever going come close to outflowing a 75mm ID Y boot, w 56/58mm id runners. ever. It's not about area, its about smoothing & directing the air flow, or i would have stuck with my all-foam unis i had on as well. it def runs better w the Y on there. IF there was room i would have just made 2 straight runners but that damn frame. lol. However, the difference was not night and day over all, the foam filters are really good. Yes, i even have an all foam ram air setup like that as well.When it comes to a filter, it's absolutely about surface area. That's a ridiculous statement. Your wye works well because of it's large interior dimensions, not the shape or some flow it creates. You want intake air to be pretty much ambient, unless you're creating a forced air situation like with a turbo.