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Originally Posted by MattR
In looking at them, the hole does not necessarily have to stay round, It can be more oval/ rectangular shaped can't it? I would definately want to make the opening the biggest part of the system, in hopes that that would force the velocity up a bit.
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The inlet doesn't have to be round, my foglight openings are rectangular and they worked fine. Like you said, it's good to have the opening area larger than the duct so it will scoop in more air and accelerate it into the duct. Just find an inlet piece with the smoothest taper down to the duct size that you can.