-7%
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Manley Performance Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings
Click to zoom in

Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings

MAN612102C-4
807298104935
Piston Sets - Forged - 4cyl
4 Units In Stock - Ships Next Business Day
$ 805.63 $ 741.18
$ 741.18

SKU: 612102C-4 | UPC: 807298104935

Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm Bore 9.8:1 Dish Piston Set with Rings

Manley Platinum Series pistons deliver forged strength for 2004-2012 Subaru Impreza WRX STI EJ257 2.5L turbo engines. These +.010" overbore (99.75mm) dished pistons maintain STD 79mm stroke and 9.8:1 compression for safe boost levels up to 30psi. Engine builders choose this set with included rings for rebuilds and high-horsepower upgrades.

Key Features

  • 2618 T6 Alloy Forgings: Heat-treated high-silicon aluminum withstands extreme cylinder pressures and temperatures in turbo applications
  • Proven Skirt Design: Cam and barrel profiles with accumulator groove minimize rock and improve ring seal under high boost
  • Moly Skirt Coating: Reduces friction, galling and scuffing for quieter operation and faster break-in
  • Tool Steel Wrist Pins: H13 .927" diameter full-floating pins resist fatigue in aggressive builds
  • CP Rings Included: 1.2/1.2/2.8mm Ultra Pro ring pack ensures tight seal and low oil consumption

Product Notes

  • Compression height 1.181" (30mm). total piston weight 368g each with pin and rings
  • Hone cylinders to 99.75mm (3.928"). check clearances per Manley guidelines
  • Set of 4 pistons. MPN 612102C-4

Installation Notes

  • Professional installation recommended.
  • Bore and hone block to 99.75mm. balance rotating assembly
  • Compatible with stock EJ257 rods and crank. use ARP rod bolts for high boost

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

Why Choose Manley?

  • Engine builders and tuners depend on Manley for race-proven components
  • Consistent quality from USA manufacturing meets NHRA and rally demands
  • Exact tolerances ensure drop-in fit and long-term reliability

Frequently Asked Questions

  • Q: Will these pistons fit 2013-2021 Subaru WRX STI EJ257 engines?
    A: Yes, same EJ257 block design. confirm bore size and use for stock or built motors up to 500+whp
  • Q: What ring gap settings for 25psi boost?
    A: Top ring 0.022". second 0.022". oil 0.039" per Manley spec sheet for optimal sealing
  • Q: Is balancing required after install?
    A: Pistons are weight-matched. full rotating assembly balance advised for engines over 400hp

Shipping & Handling

  • Method: UPS Ground or FedEx
  • Availability: In stock - ships same or next business day
  • Packaging: Foam-protected Manley box, 6 x 6 x 6 inches
  • Weight: 4.65 lbs

Request For Information

Have questions about Manley 04+ Subaru WRX STi (EJ257) STD Stroke 99.75mm +.25mm 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.
Engine

Engine

Engine parts and engine bay upgrades for Dodge, Jeep, RAM, Chrysler, Chevrolet, Ford, Toyota, Nissan, Subaru, and Honda vehicles are stocked at Black Ops Auto Works. Shop oil catch cans, supercharger pulleys, thermostats, radiators, cooling parts, throttle bodies, intake manifolds, headers, ignition coils, spark plugs, sensors, gaskets, fuel pumps, valve covers, engine covers, billet cap covers, and full engine bay dress-up parts for HEMI, Hellcat, Trackhawk, Redeye, Demon, Scat Pack, RAM TRX, LS, LT, Coyote, EcoBoost, K-Series, and 2JZ builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 14,298 engine SKUs across performance, cooling, oil control, ignition, and appearance categories. What This Category Covers The Engine collection combines OEM-replacement engine service parts with performance aftermarket upgrades for supercharged, turbocharged, and naturally aspirated builds...

View Engine Products
Manley Performance

Manley Performance

Manley Performance is a New Jersey-founded engine internals manufacturer stocked at Black Ops Auto Works, supplying forged pistons, connecting rods, valves, and crankshafts across domestic and import platforms. Shop Manley H-Beam and H-Tuff connecting rods, Race Master Series valves, forged crankshafts, and valve springs for Ford Modular and Coyote, Chrysler HEMI, Subaru EJ and FA, Nissan SR20 and 2JZ, Honda B and H-series, and Mitsubishi 4B11T and Mazda MZR platforms. Every product is filterable by year, make, model, and engine code so the correct part ships the first time. Black Ops Auto Works carries 270 Manley Performance SKUs across pistons, rotating assembly, and valvetrain components. About Manley Performance Founded in 1966 by Hank Manley as Manley Speed Equipment, Manley Performance has grown into one of the most established names in high-performance engine internals. From grassroots drag racing roots in New Jersey to a second manufacturing facility in Orange, Californi...

View Manley Performance Products
Piston Sets - Forged - 4cyl

Piston Sets - Forged - 4cyl

Forged 4-cylinder piston sets built for boosted street and race engines are stocked at Black Ops Auto Works. Shop forged piston sets from leading manufacturers sized for popular 4-cylinder turbo platforms, engineered to handle high boost, high compression, and repeated hard use without the failure risk of cast pistons. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct piston set ships the first time. Black Ops Auto Works carries 402 forged 4-cylinder piston set SKUs across bore size, compression ratio, and platform fitment. What This Category Covers The Piston Sets - Forged - 4cyl collection covers complete forged piston sets for inline-4 turbo and naturally aspirated engines, sized to specific bore diameters and offered in multiple compression ratios for street, drag, and road race builds. The catalog is strongest on Manley, Wiseco, and CP-Carrillo forged sets for common Honda, Subaru, Mitsubishi, and Mazda 4-cylinder turbo platforms....

View Piston Sets - Forged - 4cyl Products
Pistons

Pistons

Pistons and piston components for engine builds and rebuilds are stocked at Black Ops Auto Works. Shop forged and cast piston sets, piston rings, piston pins, and pin locks for 4, 5, 6, and 8-cylinder gas engines and diesel applications, including Cummins 5.9L 12-valve, Toyota 2JZGTE, Honda K20, BMW and Toyota B58, GM 6.2L LT1 and L86, Chrysler Gen3 Hemi 6.2L Hellcat and 6.4L Apache, and Nissan VQ35DE builds. Every product is filterable by bore size, engine platform, compression ratio, and application so the correct piston set ships the first time. Black Ops Auto Works carries 997 piston and piston component SKUs across forged, cast, and diesel-specific categories. What This Category Covers Pistons are the core moving component of any engine build, transferring combustion force into rotational power through the connecting rod and crankshaft. This category covers complete piston sets plus the individual components, rings, pins, and pin locks, needed for a full rebuild or performa...

View Pistons Products
Military & First Responder Discounts

Military & First Responder Discount Program

Black Ops Auto Works proudly honors active duty military, veterans, National Guard, reserves, police officers, firefighters, and EMTs with an exclusive 5% discount on all performance parts and carbon fiber upgrades. Verify instantly and start saving today.

Learn More & Apply

Your cart

×