PROX Piston Kit 01.6521.B

When your engine is running on stock pistons, you're leaving performance on the table and risking catastrophic failure under sustained boost or high RPM loads. The PROX Piston Kit 01.6521.B delivers OEM-equivalent reliability with precision manufacturing that ensures consistent ring seal, reduced blowby, and the durability you need for both street and competition use. This complete kit eliminates the guesswork of sourcing matching components—everything you need to rebuild right, the first time.

Built from high-silicon-content aluminum alloy and CNC-machined to exacting tolerances, these pistons absorb heat efficiently while maintaining dimensional stability across extreme temperature swings. Whether you're refreshing a tired engine or building for increased boost, PROX delivers the engineering standard that professional rebuilders trust.

• Japanese OEM-equivalent design
• High-silicon aluminum alloy
• CNC-precision machined
• Meets/exceeds OEM specs
• Includes piston rings
• Wrist pins included
• Circlips included
• Complete rebuild kit
• Consistent ring seal
• Reduced blowby
• MPN: 01.6521.B