JE Pistons 291059 SUB STI EJ257/EJ20 99.5mm Bore 8.5:1 Forged Piston Kit Set of 4

SKU: JEP291059
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About JE Pistons

JE Pistons engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full JE Pistons lineup with fast shipping and expert fitment support — order with confidence.

JE Pistons 291059 Forged Piston Kit for Subaru STI EJ257/EJ20 Engines

Elevate your Subaru STI's performance with the JE Pistons 291059 Forged Piston Kit. Specifically designed for the EJ257 block with an EJ20 head configuration, this kit features a 99.5mm bore and an 8.5:1 compression ratio, perfect for high-output builds. Crafted in the USA from premium 2618 aluminum, these pistons are engineered to withstand the extreme demands of racing and performance tuning.

Uncompromising Performance & Durability:

  • High-Strength Construction: Made in the USA using 2618 aluminum for superior tensile strength, crucial for high-boost and high-RPM applications.
  • Optimized Bore Size: Precision 99.5mm bore ensures a perfect fit for EJ257 blocks, accommodating the EJ20 head configuration.
  • Ideal Compression Ratio: The 8.5:1 compression ratio is well-suited for forced induction setups, allowing for significant boost pressure while maintaining engine integrity.
  • Reduced Friction & Weight: Features JE Pistons' exclusive Forged Side Relief (FSR) design, minimizing friction and power loss, and reducing overall weight with a shorter wrist pin.
  • Enhanced Longevity: Skirt coatings (application dependent) help reduce friction and wear on piston skirts and cylinder walls, contributing to extended engine life and quieter operation.
  • Improved Sealing: An accumulator groove (application dependent) aids in reducing combustion gas pressure, preventing ring flutter and ensuring a consistent, reliable ring seal.
  • Complete Engine Solution: Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings for a complete and hassle-free installation.

The JE Pistons 291059 kit is the ultimate choice for Subaru STI owners looking to build a powerful and reliable engine for track use or extreme street performance. Trust in JE Pistons' decades of expertise for your high-performance build. Find this exceptional piston kit and more at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About JE Pistons

JE Pistons engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full JE Pistons lineup with fast shipping and expert fitment support — order with confidence.

JE Pistons 291059 Forged Piston Kit for Subaru STI EJ257/EJ20 Engines

Elevate your Subaru STI's performance with the JE Pistons 291059 Forged Piston Kit. Specifically designed for the EJ257 block with an EJ20 head configuration, this kit features a 99.5mm bore and an 8.5:1 compression ratio, perfect for high-output builds. Crafted in the USA from premium 2618 aluminum, these pistons are engineered to withstand the extreme demands of racing and performance tuning.

Uncompromising Performance & Durability:

  • High-Strength Construction: Made in the USA using 2618 aluminum for superior tensile strength, crucial for high-boost and high-RPM applications.
  • Optimized Bore Size: Precision 99.5mm bore ensures a perfect fit for EJ257 blocks, accommodating the EJ20 head configuration.
  • Ideal Compression Ratio: The 8.5:1 compression ratio is well-suited for forced induction setups, allowing for significant boost pressure while maintaining engine integrity.
  • Reduced Friction & Weight: Features JE Pistons' exclusive Forged Side Relief (FSR) design, minimizing friction and power loss, and reducing overall weight with a shorter wrist pin.
  • Enhanced Longevity: Skirt coatings (application dependent) help reduce friction and wear on piston skirts and cylinder walls, contributing to extended engine life and quieter operation.
  • Improved Sealing: An accumulator groove (application dependent) aids in reducing combustion gas pressure, preventing ring flutter and ensuring a consistent, reliable ring seal.
  • Complete Engine Solution: Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings for a complete and hassle-free installation.

The JE Pistons 291059 kit is the ultimate choice for Subaru STI owners looking to build a powerful and reliable engine for track use or extreme street performance. Trust in JE Pistons' decades of expertise for your high-performance build. Find this exceptional piston kit and more at GGCRACING.

Product Details

Product Description

About JE Pistons

JE Pistons engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full JE Pistons lineup with fast shipping and expert fitment support — order with confidence.

JE Pistons 291059 Forged Piston Kit for Subaru STI EJ257/EJ20 Engines

Elevate your Subaru STI's performance with the JE Pistons 291059 Forged Piston Kit. Specifically designed for the EJ257 block with an EJ20 head configuration, this kit features a 99.5mm bore and an 8.5:1 compression ratio, perfect for high-output builds. Crafted in the USA from premium 2618 aluminum, these pistons are engineered to withstand the extreme demands of racing and performance tuning.

Uncompromising Performance & Durability:

  • High-Strength Construction: Made in the USA using 2618 aluminum for superior tensile strength, crucial for high-boost and high-RPM applications.
  • Optimized Bore Size: Precision 99.5mm bore ensures a perfect fit for EJ257 blocks, accommodating the EJ20 head configuration.
  • Ideal Compression Ratio: The 8.5:1 compression ratio is well-suited for forced induction setups, allowing for significant boost pressure while maintaining engine integrity.
  • Reduced Friction & Weight: Features JE Pistons' exclusive Forged Side Relief (FSR) design, minimizing friction and power loss, and reducing overall weight with a shorter wrist pin.
  • Enhanced Longevity: Skirt coatings (application dependent) help reduce friction and wear on piston skirts and cylinder walls, contributing to extended engine life and quieter operation.
  • Improved Sealing: An accumulator groove (application dependent) aids in reducing combustion gas pressure, preventing ring flutter and ensuring a consistent, reliable ring seal.
  • Complete Engine Solution: Includes high-quality wrist pins, locks, and JE Pro Seal premium piston rings for a complete and hassle-free installation.

The JE Pistons 291059 kit is the ultimate choice for Subaru STI owners looking to build a powerful and reliable engine for track use or extreme street performance. Trust in JE Pistons' decades of expertise for your high-performance build. Find this exceptional piston kit and more at GGCRACING.

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