Yes buy the ducts, they would make your pads last longer. Two piece are great. If you can justify spending that much $$, more power to you. Cryo treatment works great. I used to have cracking issues with my cross-drilled Corvette rotors, problems were solved after I starting cryoing treating my rotors. Rotor is a heat sink, it just have to hold the heat and dissipate them....
I have over 12 track days on my car on 4 different set of pads, barely any wear on my rotor....
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