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Cotton's will be using a Turbonetics 70mm turbocharger with a P-Trim .82 A/R housing. As an ATR downpipe with an external wastegate will be used, Brian uses a template to correctly port the wastegate hole. Leave it as-is and you risk massive boost creep; and in internal wastegate applications, port it too much and the puck won't seal correctly. When it's the correct size, Cotton polishes the hole with a stone. View Related Article
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