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I'd be concerned about the "new engine w/3mm apex seals". That is a kind of a red flag when the ad says "installed by mazda" right next to it, because mazda dealers typically don't install or work on modified engines. Stock it came with 2mm apex seals. Not saying 3mm seals are a bad thing, but doing the machine work to adapt the rotors to use 3mm seals takes some skill - not all engine builders can do it right.
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