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there in the home plumbing section, its black abs plastic, funny thing is I just changed my adapters to aluminum ones from advanced, I got the 2 1/4 to 2 1/2 exhaust adapter then to it to my local muffler shop so he could stretch the 2 1/2 side to 3". I did this because it gave me a half an inch more room on the intake side because the abs adapters are so thick. Good luck all in all everything cost me $38
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