Forged internals?
Forged metals are more resistent to heat, and are stronger material - properties that are needed to withstand higher boost levels and nitrous shots.
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Forging refines and improves the grain structure and thus improves physical properties of the metal. Physical properties (strength, ductility and toughness) are typically much better in a forging than in the base metal.
The forged pieces are also free of voids or defects that can sometimes appear in casted metals. After the forging, the steel generally gets a stress-relief heat treatment and then is machined to the final product.





