Elegant Manley 8.5:1 Comp Ratio Pistons | 04-15 Wrx/sti Extreme Duty Stroker 100.0mm +.50mm Size Bore (632405ce-4) Deluxe Edition [JDz9pZ7S]

Manley 8.5:1 Comp Ratio Pistons for WRX/STI

Introducing the Manley 8.5:1 Comp Ratio Pistons, designed specifically for the 04-15 WRX/STI models. These pistons are engineered to handle extreme duty conditions, making them the perfect choice for high-performance applications. Crafted from 2618 alloy, these pistons offer exceptional strength and durability, ensuring they can withstand the rigors of high boost and high-stress environments. The inclusion of an offset wrist pin design and skirt coating further enhances their performance and longevity.

• High-Performance Design: The 8.5:1 compression ratio optimizes power output and efficiency, providing a seamless driving experience.
• Durable Construction: Made from premium 2618 alloy, these pistons are built to last, even under the most demanding conditions.

Key Features and Specifications

These Manley pistons come equipped with a standard 2.500" x .180" wall premium chrome moly wrist pin (P/N 42346), offering excellent strength and reliability. For those seeking an upgrade, 9310 alloy .210" wall pin upgrades are available. The pistons also feature premium steel top rings with Napier style second rings and higher tension oil rings for ultimate oil control. This combination ensures superior performance and reduces oil consumption, making them ideal for both track and street use.

• Advanced Pin Design: The offset wrist pin design reduces stress and minimizes noise, providing a smooth and quiet operation.
• Superior Oil Control: The combination of Napier style second rings and higher tension oil rings ensures optimal oil control and reduced oil consumption.

Superior Oil Control and Performance

Manley's EJ257 pistons now include Napier style second rings and higher tension oil rings (by Total Seal) for superior oil control. This innovative design helps maintain consistent engine performance and extends the life of the engine. The recommended clearance for these pistons is .003" for mildly boosted applications and .0035" for highly boosted applications, ensuring proper fitment and optimal performance.

• Innovative Ring Design: The inclusion of Napier style second rings and higher tension oil rings provides superior oil control and reduces oil consumption.
• Optimal Clearance: The recommended clearances ensure proper fitment and optimal performance in both mildly boosted and highly boosted applications.