-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
12 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 ? Fill out the form below and we'll get back to you by the next business day.
Engine

Engine

This engine parts collection covers oil catch cans, thermostats, thermostat housings, radiator components, coolant accessories, engine covers, fuse box covers, cap covers, throttle bodies, supercharger pulleys, idler pulleys, tensioner pulleys, and engine bay dress-up parts for trucks, SUVs, muscle cars, boosted builds, high-horsepower street cars, and performance vehicles that need better reliability, cooling, airflow, oil control, and under-hood styling. The collection is particularly strong for Dodge Challenger, Charger, Durango, Jeep Grand Cherokee Trackhawk, and Ram TRX platforms running 6.2L Hellcat, 6.4L HEMI, and 5.7L HEMI engines, where oil catch can and cooling upgrades address known OEM weaknesses in the PCV and thermal management systems. Import performance platforms including GM LS-based builds, Chevrolet Camaro, and Corvette applications are also represented through Mishimoto, CSF, and ZPE GripTec product lines. Builders who invest in engine bay organization and reliab...

View Engine Products
Manley Performance

Manley Performance

Founded in 1966 by Hank Manley, Manley Performance Products has become one of the most respected names in high-performance engine components. Originally launched as Manley Speed Equipment, the company quickly earned a reputation for precision manufacturing, durability, and race-proven performance. From grassroots beginnings in New Jersey to global recognition in professional motorsports, Manley Performance continues to set the standard in high-performance automotive parts. Manley Performance Engine Parts Manley is known for manufacturing premium internal engine components designed for street, strip, and professional racing applications. Their product line includes: Manley stainless steel valves Manley forged pistons Manley connecting rods (H-Beam, I-Beam, Turbo Tuff, Pro Series) Manley camshafts Manley crankshafts Manley valvetrain components Valve springs, retainers, and hardware Every Manley component is engineered with strict quality control and race-driven innov...

View Manley Performance Products
Piston Sets - Forged - 4cyl

Piston Sets - Forged - 4cyl

Welcome to our exclusive collection of Piston Sets - Forged - 4cyl. These piston sets are engineered for performance enthusiasts looking to enhance their vehicle's power and efficiency. With a focus on quality and durability, our forged piston sets are the perfect upgrade for your 4-cylinder engine.   Key Features High Strength: Designed to withstand the extreme conditions of high-performance engines. Precision Engineering: Each piston is crafted to ensure optimal fit and function. Enhanced Performance: Improves combustion efficiency, leading to better power output. Lightweight Design: Reduces overall engine weight for improved acceleration and handling.   Why Choose Our Forged Piston Sets? Our Piston Sets - Forged - 4cyl collection is the result of extensive research and development. Here’s why you should choose our products: Manufactured using premium materials for longevity and performance. Tested rigorously to meet the highest industry standards. Suitable for both st...

View Piston Sets - Forged - 4cyl Products
Pistons

Pistons

Welcome to our Pistons collection, where quality meets performance. Whether you're a professional mechanic or a DIY enthusiast, our curated selection of pistons is designed to enhance your engine's efficiency and reliability of your engines performance.   Why Choose Our Pistons? High-Quality Materials: Our pistons are crafted from top-notch materials to ensure durability and longevity from various manufactues. Enhanced Performance: Designed to optimize your engine's performance, our pistons deliver power and efficiency for all makes and models. Wide Range: Choose from a variety of sizes and specifications to meet your specific needs from daily drivers torace cars. Competitive Pricing: Enjoy premium quality without breaking the bank.   Shop Our Pistons Collection Browse through our extensive range of pistons below: High-Performance Racing Pistons Standard Replacement Pistons Lightweight Forged Pistons Custom Fit Pistons Experience unmatched performance with our Pistons...

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

×