Manley 612001C-1 Forged Piston Set EJ257 99.55mm 8.5:1 Compression

The Manley 612001C-1 forged piston and ring set is engineered specifically for 2004+ Subaru WRX STI EJ257 engines. These high-performance pistons feature a 99.55mm bore diameter (+0.5mm oversize), making them ideal for rebuilt engines or performance builds requiring a slight overbore.

Key Specifications:

• Bore diameter: 99.55mm (standard +0.5mm oversize)
• Compression ratio: 8.5:1
• Forged aluminum construction for superior strength and heat resistance
• Complete piston and ring set included
• Designed for EJ257 turbo motors (2004+ WRX STI)

Features:

• Precision-forged from aerospace-grade aluminum alloy
• Lower compression ratio optimized for high-boost turbo applications
• Pre-coated skirts reduce friction and cylinder wear during break-in
• Includes premium piston rings matched to bore specifications
• Tight tolerances ensure proper sealing and performance

Manley pistons are a trusted choice among performance builders and racers, offering exceptional durability under extreme conditions. The 8.5:1 compression ratio provides the headroom needed for aggressive tuning and high boost levels while maintaining detonation resistance on pump gas or race fuel.