JE Shelf Pistons 99.5mm Bore 8.5:1 CR | 2004-2015 Subaru STI EJ25 w/EJ20 Heads (291059)

99.5mm Pistons for Subaru EJ25 w/ EJ20 Heads

JE Pistons new FSR forgings for the 2004-2015 Subaru STI EJ257 engine with EJ20 heads are both strong and lightweight! The new FSR design has undergone extensive on-track testing to ensure flawless performance under the most demanding conditions.

Features

• 2618 T6 high tensile forged aluminum
• Comp Ratio: 8.5:1
• Bore: 99.5mm
• Gram Weight: 411
• Dome CC: -25.5
• Head CC: 48.0
• Stroke: 79mm
• Rod: 130.5mm

Benefits

• Specifically engineered for high horsepower Subaru engines.
• Dome and dishes feature smooth flowing radii for excellent flame travel.
• Pin fitting and Tru Arc locks included.
• JE Pro Seal Rings Included.
• Piston Profile Matches EJ20 Chamber Profile. No Cylinder Head Mofications Necessary.

Applications

• 2004-2015 Subaru STI
• Notes: Designed for EJ257 Motor with EJ20 Heads

What's in the box?

• (4) Pistons
• Pin fitting and Tru Arc locks included
• JE Pro Seal Rings Included
• .905 x 2.250 straight wall carbon steel wrist pin

Warranty

• Manufacturer Standard Warranty