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I have some 2 1/2" and I think a 2" to 2 1/2" that I used off my turbo, so doubt those will help...But, was going to suggest www.siliconeintakes.com for good prices and quality. I bought all new couplers for mine (were blue, and now black) and they were reasonable and quick shipment. Another option that I also did (but only 3") was buy some of that industrial coolant (silicone) hose that was light blue; only paid a few bucks for a 6' piece off e-bay some time ago (was a good hose, not a china special, fwiw, if you look around).