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Mahle use 4032 which is less expansive allowing just a touch tighter wall clearance but this material is not as strong as 2618. JE use 2618. For power produced by 911 engines I don’t think it matters which material is used for strength. In a perfect world Mahle liners and Mahle pistons would always be run, but I see nothing wrong with Mahle liners with JE pistons
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No physical quantity completely explains its own existence
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