Upgrade your Subaru WRX or STI with the Manley Performance 632200CE-4 Extreme Duty Piston Set. Designed for the 04+ models, these pistons feature a 99.50mm bore and a high compression ratio of 8.5:1, making them perfect for high-performance builds. Crafted from durable 2618 alloy forgings, they are built to withstand the rigors of racing and tuning, providing both strength and longevity. The Platinum Series pistons come with advanced features including proven cam and barrel skirt profiles, tool steel wrist pins, and moly skirt coatings on select parts. This combination ensures that your engine performs at its best while maintaining reliability even under extreme conditions. Join the ranks of professional engine builders who trust Manley for their performance needs. <b>Features:</b> * Material: 2618 alloy forgings for enhanced durability: Material: 2618 alloy forgings for enhanced durability * Compression Ratio: 8.5:1 for increased performance: Compression Ratio: 8.5:1 for increased performance * Wrist Pins: Tool steel wrist pins for strength: Wrist Pins: Tool steel wrist pins for strength * Skirt Coating: Moly skirt coatings on select parts for reduced friction: Skirt Coating: Moly skirt coatings on select parts for reduced friction * Design: Proven cam and barrel skirt profiles for optimal performance: Design: Proven cam and barrel skirt profiles for optimal performance