need 2 1/2 diameter pipe

so i got this injen air filter and it fits inside the stock rubber intake hose but is supposed to be clamped down onto a metal hose. because of that these ribs on the inside of the filter i think is causing a whistling noise when the engine is running. someone suggested putting pvc pipe on the inside of the filter and clamp the rubber hose down on it to fix the noise which would work perfect but pvc pipes come in 2 3/8 closest which just falls into the filter. anyone know any kind of thing i can use that comes in 2 1/2 diameter?

Sometimes you can find tubing in auto parts stores to fix exhaust systems. Typically, if it has a bend in it, it isn't mandel bent, and has large wrinkles on the inside of the bend.
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Failing that, you can look in the internet. It's all over the place.
Just don't call it pipes, people like to refer to it as "tubing".
Here's one place I found in about 2.5 seconds.
http://www.spectreperformance.com/cat/air-intake-components-tubes-aluminum-2-5
I suggest stainless steel, if it needs to be angled, I'd suggest it be mandrel bent for less flow restriction.

Brandon, I suggested a site in one of your other threads. www.siliconeintakes.com