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I'd think for the coupler thats going to attach to the spindle duct, you'd want more temp handling because it will be so close to the rotors. For the hose beyond that coupler, whatever material should be fine.
If 2.5" hose fits and you don't rip it off every other weekend turning your wheels, then thats better. There's no sense in running bigger hose if it pisses you off and you end up taking it off all the time. Run what you can leave on 24/7/365.
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