Manley EJ257 99.5mm STD Bore 8.5:1 Dish Piston Set w/ Rings — Fits 2004-2012 Subaru WRX STi

Watch in action

Manley Performance Forged Pistons for Subaru WRX STi (EJ257)

Boost the performance and reliability of your 2004-2012 Subaru WRX STi (EJ257) with these high-quality forged pistons from Manley Performance. Featuring a 99.5mm standard bore size and an 8.5:1 compression ratio dish design, these pistons are engineered to withstand the demands of high-performance and track use.

Precision Engineered for Power:

• 2618 Alloy Forgings: Constructed from premium domestic 2618 alloy, providing exceptional strength and resistance to extreme thermal and mechanical stress.
• Chrome Moly Wrist Pins: Comes standard with durable Chrome Moly wrist pins. Optional upgrades to 9310 and Turbo Tuff/DLC alloys are available for enhanced durability in extreme applications.
• Exact Ring Land Machining: Meticulously machined ring lands and grooves ensure optimal ring seal, leading to improved power delivery and reduced oil consumption.
• Optimized Cam and Barrel Profiles: Designed with advanced profiles that enhance power output while minimizing friction and wear on cylinder walls for extended engine life.
• Manley's Unique Fixturing: Benefits from Manley's specialized fixturing process, which ensures perfect squareness between the piston skirt and ring grooves, critical for high-RPM engine operation.

These Manley pistons are an ideal choice for WRX STi owners looking to build a powerful and reliable engine, whether for street performance, autocross, or track days. The 8.5:1 compression ratio is versatile for various tuning strategies, especially with forced induction. Invest in the quality and performance of Manley Performance parts for your Subaru's engine, available at GGCRACING.