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I say totally skip the aluminum piston head and get something synthetic - silicon, POM or polycarbonate.
It's been proven that an aluminum piston head with even a PDI 120% piston head can crack your gearbox in the winter.
As for the aluminum piston... I still don't like using them because they tend to wear faster than polycarbonate. Plus the added weight of it is extra stress on your gearbox.
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