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Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings
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Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 8.5:1 Dish Piston Set with Rings

MAN612002C-4
807298026589
Piston Sets - Forged - 4cyl
11 Units In Stock - Ships Next Business Day
$ 805.63 $ 741.18
$ 741.18

SKU: 612002C-4 | UPC: 807298026589

Manley 2004-2021 Subaru WRX STI EJ257 STD Stroke 99.75mm +0.25mm Bore 8.5:1 Dish Piston Set with Rings

Manley Platinum Series pistons deliver forged strength for 2004-2021 Subaru WRX STI models with EJ257 engines. Sized at 99.75mm bore (0.25mm over stock), standard 79mm stroke, and 30mm compression height for direct replacement in high-performance turbo setups. Includes matched rings and pins for reliable power handling under boost.

Key Features

  • Forged 2618 T6 Alloy: High-tensile aluminum withstands extreme cylinder pressures and temperatures in boosted applications
  • 8.5:1 Dish Design (-6.2cc volume): Lowers compression for safe high-boost operation while maintaining efficiency
  • Moly Skirt Coating: Minimizes friction and wear for smoother operation and longer skirt life
  • Tool Steel Wrist Pins (22mm dia): Heavy-duty pins with wear-resistant coating support aggressive tuning
  • Optimized Skirt Profiles & Accumulator Grooves: Improves ring seal, reduces blow-by, and enhances overall engine sealing

Product Notes

  • Rings included and pre-gapped to specifications for quick assembly
  • Requires cylinder honing to 99.75mm and piston-to-wall clearance check (typically 0.003-0.004 inch)
  • Ships as balanced set of four pistons, pins, and rings

Installation Notes

  • Professional installation recommended.
  • Hone cylinders precisely to 99.75mm bore size before installation
  • Compatible with stock-length 130mm connecting rods. verify ring end gaps after mock-up

This Part Fits

Year Make Model Submodel
2004-2012 Subaru Impreza WRX STI
2007,2011-2012 Subaru Impreza WRX STI Limited
2010 Subaru Impreza WRX STI Special Edition
2013-2014 Subaru Impreza WRX STI
2015-2021 Subaru WRX STI
2008-2011 Subaru Legacy 2.5 GT Spec B

Why Choose Manley?

  • Relied on by professional engine builders for EJ257 rebuilds
  • Track-proven durability in racing and street turbo applications
  • Precision CNC-machined tolerances for consistent fit and performance

Frequently Asked Questions

  • Q: Will these pistons fit 2015-2021 Subaru STI models?
    A: Yes, direct fit for all 2004-2021 EJ257-equipped WRX STI models including hatchback and sedan variants
  • Q: What alloy is used in these pistons?
    A: Forged from 2618 T6 aircraft-grade aluminum alloy for maximum strength-to-weight ratio
  • Q: Are the rings pre-gapped and what sizes?
    A: Yes, includes premium steel top ring (1.2mm), ductile iron second (1.5mm), and 3-piece oil ring (2.8mm total). gaps set to Manley specs

Shipping & Handling

  • Method: UPS or FedEx Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Protective foam inserts in sturdy box, 8 x 6 x 4 inches
  • Weight: 3.1 lbs

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