Black Friday Doorbuster Manley 8.5:1 Comp Ratio Piston | 04-15 Wrx/sti Extreme Duty De-stroker 99.5mm Std Size Bore (632000ce-4) Series [UC3wFd1O]

Manley 8.5:1 Comp Ratio Pistons for WRX/STI

Manley has revolutionized the Subaru piston market with the introduction of their new Turbo Tuff pistons lineup, specifically designed for the EJ25 engine. These pistons are the pinnacle of performance, engineered to handle the extreme conditions of high-boosted applications while maintaining a quiet and trouble-free operation for daily drivers. The 8.5:1 compression ratio ensures optimal power output and efficiency, making them a top choice for enthusiasts seeking to enhance their Subaru's performance.

Key Features and Specifications

The Manley 8.5:1 Comp Ratio Pistons are crafted from premium 2618 alloy, known for its exceptional strength and durability. They feature an offset wrist pin design for reduced weight and increased performance, as well as a skirt coating to minimize friction and wear. Each piston comes with a standard 2.500" x .180" wall premium chrome moly wrist pin (P/N 42346), and upgrades to 9310 alloy .210" wall pins are available for even greater strength. The pistons are also equipped with premium steel top rings, Napier style second rings, and higher tension oil rings for ultimate oil control, ensuring superior performance and longevity.

Superior Oil Control and Performance

Manley's EJ257 pistons now include Napier style second rings and higher tension oil rings by Total Seal, providing superior oil control and reducing oil consumption. This feature is particularly beneficial for high-boost applications, where maintaining proper oil pressure is crucial for engine health. The recommended clearance for these pistons is .003" for mildly boosted engines and .0035" for highly boosted engines, ensuring a perfect fit and optimal performance. With these pistons, you can expect increased power, improved fuel efficiency, and extended engine life, making them an essential upgrade for any Subaru enthusiast.