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Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings
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Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings

MAN612100C-4
807298103617
Piston Sets - Forged - 4cyl
Out of stock
$ 805.63 $ 741.18

SKU: 612100C-4 | UPC: 807298103617

Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings

Manley Platinum Series piston set delivers forged strength for 2004-2012 Subaru Impreza WRX STI models with EJ257 engines. Designed with 99.5mm standard bore and standard stroke for direct fit in high-boost applications. Includes premium rings for immediate use in performance rebuilds.

Key Features

  • 2618-T61 Alloy Forgings: High-strength material withstands extreme turbo pressures and heat cycles in EJ257 builds.
  • Accumulator Groove: Prevents ring flutter at high RPM for consistent sealing and power delivery.
  • Optimized Skirt Profiles: Cam and barrel shapes reduce friction and noise while improving ring seal.
  • Moly Skirt Coating: Lowers wear on cylinder walls and enhances break-in process.
  • Tool Steel Wrist Pins: H13 HRC 38-44 hardness with C45 circlips for secure retention under boost.

Product Notes

  • Rings are pre-gapped and matched to pistons for Subaru EJ257 specifications.
  • Set includes 4 pistons with pins and rings. compression height 30.8mm.
  • Shipping box dimensions 8 x 6 x 6 inches. net weight 4.2 lbs (392g per piston).

Installation Notes

  • Professional installation recommended.
  • Cylinder hone to 99.50-99.51mm. check piston-to-wall clearance at 0.003-0.004 inch.
  • Balance rotating assembly. use assembly lube on skirts and pins.

This Part Fits

Year Make Model Submodel
2006-2012 Subaru Impreza WRX
2006-2007,2010-2012 Subaru Impreza WRX Limited
2009-2012 Subaru Impreza WRX Premium
2004-2012 Subaru Impreza WRX STI
2007,2011-2012 Subaru Impreza WRX STI Limited
2010 Subaru Impreza WRX STI Special Edition
2006-2007 Subaru Impreza WRX TR

Why Choose Manley?

  • Proven in WRX STI race engines from drag to rally applications.
  • Exact tolerances ensure reliable boost handling up to 40psi.
  • Hand-built in USA with FEA-optimized designs for EJ257.

Frequently Asked Questions

  • Q: Does this fit 2004-2007 WRX STI with EJ257?
    A: Yes, direct replacement for 99.5mm bore STD stroke EJ257 in all listed 2004-2012 STI models.
  • Q: What ring set is included?
    A: Manley 61556-4 rings with CBN hone grooves, pre-gapped to 0.012-0.022 inch specs.
  • Q: What warranty covers these pistons?
    A: Limited lifetime warranty against manufacturing defects when installed by certified builder.

Shipping & Handling

  • Method: UPS Ground or USPS Priority
  • Availability: In stock - ships same or next business day
  • Packaging: Foam-protected box 8x6x6 inches
  • Weight: 6 lbs shipping weight

Request For Information

Have questions about Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.5mm STD Bore 9.8:1 Dish Piston Set with Rings? Fill out the form below and we'll get back to you by the next business day.
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