Manley Performance

Manley 04+ Subaru WRX STi (EJ257) STD Stroke 100mm +.5mm Bore 8.5:1 Dish Piston Set with Rings - 612005C-4

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SKU:
MAN612005C-4
UPC:
807298042114
MPN:
612005C-4
Availability:
Regularly stocked product
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MSRP: $760.03
$699.23
— You save $60.80
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Description

Are Manley forged pistons a good upgrade for my 4-cylinder engine?
Manley forged pistons are engineered with 2618 alloy for ultimate strength, significantly enhancing reliability for your 4-cylinder engine.

Do Manley forged pistons require professional installation?
Professional installation is recommended for Manley forged pistons to ensure optimal performance and proper engine assembly.

Manley Piston Sets - Forged - 4cyl deliver ultimate strength and reliability for demanding motorsport applications, scoring a 9 for Track/Autocross use. Engineered with 2618 alloy forgings, these pistons provide superior strength to withstand extreme boost pressures and high RPMs. Experience confident engine builds and unparalleled performance with Manley's proven designs.

What Owners Say

Owners and enthusiasts consistently praise Manley pistons as exceptional value, with many considering them the best bang-for-the-buck option in the forged piston market. Builders appreciate the 2618 forging quality that matches higher-priced competitors like CP and Wiseco, while noting significant weight savings—up to 46 grams lighter than OEM assemblies in some applications. Earlier complaints about excessive weight have been addressed by the manufacturer, demonstrating Manley's responsiveness to feedback. Multiple engine builders report long-term reliability across numerous builds using Manley H-beam rods and pistons together. For enthusiasts seeking proven performance without premium pricing, Manley has earned a solid reputation in the building community.

Key Features

  • 2618 alloy forgings
  • proven cam and barrel skirt profiles
  • tool steel wrist pins
  • moly skirt coatings on select part numbers
  • Chrome Moly Wrist Pins
  • 2618 Alloy Forgings

Why Choose the MAN Piston Sets - 4 Cyl

Delivers extreme durability for relentless track days and spirited driving.

Achieves smoother engine operation and reduced friction for enhanced power delivery.

Provides superior strength to withstand extreme boost pressures and high RPMs.

Transforms your Subaru's engine for uncompromising performance and longevity.

Who Is This For?

Track / Autocross — 9/10
2618 alloy forgings offer ultimate strength under extreme conditions.

Drag Racing — 9/10
2618 alloy forgings provide ultimate strength for high stress.

Racing Competition — 9/10
2618 alloy forgings ensure reliability under extreme conditions.

Street Performance — 8/10
Proven cam and barrel skirt profiles enhance performance.

Engine Performance — 8/10
2618 alloy forgings and proven profiles enhance engine output.

Frequently Asked Questions

What Subaru Impreza models are compatible with these Manley 4-cylinder forged pistons?

These Manley forged pistons are precisely engineered to fit 2004-2012 Subaru Impreza models. This direct fitment ensures seamless integration into your specific vehicle's engine. Trust in these pistons to provide a perfect match for your performance Subaru.

What is the recommended installation process for these forged pistons?

Professional installation is strongly recommended for these forged pistons, requiring confirmation with a qualified technician. This advanced installation ensures proper seating and optimal performance of your engine components. Achieve peak engine reliability by entrusting the installation to experts.

How do these pistons contribute to demanding motorsport applications?

Achieve extreme engine strength with these pistons, scoring a 9/9 for Track/Autocross usage. Their 2618 alloy forgings deliver unparalleled reliability under the most extreme racing conditions. Experience uncompromising performance built for the rigors of motorsport competition.

Is upgrading to these forged pistons from OEM worthwhile for a Subaru Impreza?

Upgrading to these forged pistons provides superior strength to withstand extreme boost pressures and high RPMs, significantly enhancing engine longevity. The advanced 2618 alloy forgings offer a substantial leap in durability beyond stock components. Invest in this upgrade for truly transformative engine performance.

What key material benefits do these Manley pistons offer?

These pistons are constructed from 2618 alloy forgings, delivering ultimate strength and reliability under extreme conditions. This robust material composition ensures exceptional durability for relentless track days and spirited driving. Benefit from the superior strength engineered for high-stress performance.

Additional Resources

Official Manley Performance Product Page

Important Notices

⚠️ CARB Notice: This product is NOT legal for street use in California under CARB (California Air Resources Board) regulations. For off-road or race use only.

⚠️ Proposition 65 Warning: This product can expose you to chemicals including lead and/or other substances known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

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Additional Information

CARB:
This product is not CARB Legal and not for sale in California
Clearance Item:
N
MPN:
612005C-4
Proposition 65:
Y
Case Lot Quantity:
1
Category:
Engine Components>Piston Sets - Forged - 4cyl
Product Level:
Premium Performance
Track / Autocross:
9/10
Drag Racing:
9/10
Racing Competition:
9/10
Street Performance:
8/10
Engine Performance:
8/10
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