-7%
Manley Performance Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings
Click to zoom in

Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings

MAN612202C-4
807298107875
Piston Sets - Forged - 4cyl
7 Units In Stock - Ships Next Business Day
$ 805.63 $ 741.18
$ 741.18

SKU: 612202C-4 | UPC: 807298107875

Manley Subaru EJ257 99.75mm +.25mm Bore 8.5:1 Dish Platinum Series Piston Set with Rings 2004-2021 WRX STI

Upgrade your Subaru EJ257 2.5L turbo engine with this Manley Platinum Series piston set designed for 2004-2021 WRX STI models. The 99.75mm bore (+.25mm oversize) and 8.5:1 dish configuration support high-boost applications while maintaining reliability. Each set includes premium rings for a complete, balanced assembly ready for professional engine builds.

Key Features

  • 2618 T6 Alloy Forgings: High-temperature aluminum alloy provides strength to withstand extreme boost pressures and RPMs in turbocharged EJ257 engines
  • Optimized Skirt Profiles: Proven cam and barrel skirt designs minimize friction, reduce wear, and ensure quiet operation under load
  • Tool Steel Wrist Pins: Heavy-duty 21mm x 63mm pins with wire locks deliver secure rod connection and long-term durability
  • Moly Skirt Coating: Applied to select surfaces to prevent scuffing, galling, and cylinder wall damage during break-in and operation
  • Premium Ring Pack Included: Steel top ring, ductile iron second ring, and three-piece oil ring set with pre-gapped rings for exact 99.75mm bore fit

Product Notes

  • Bore engine block to 99.75mm (3.928 inches) prior to installation
  • Pistons balanced as a matched set of four to 388 grams each
  • Ships in protective Manley packaging for damage-free delivery

Installation Notes

  • Professional installation recommended.
  • Requires cylinder honing to 99.75mm with 45-degree crosshatch pattern
  • Compatible with stock EJ257 connecting rods (130mm length) and 79mm stroke crankshaft

This Part Fits

Year Make Model Submodel
2004-2007 Subaru Impreza WRX STI All (EJ257)
2008-2014 Subaru Impreza WRX STI All (EJ257)
2015-2021 Subaru WRX STI All (EJ257)

Why Choose Manley?

  • Engine builders and tuners select Manley for consistent results in competition engines
  • Forged construction handles 40+ psi boost levels with repeated dyno passes
  • Precision machining includes 30mm compression height for exact deck clearance

Frequently Asked Questions

  • Q: Which Subaru models use the EJ257 engine for this piston set?
    A: Fits all 2004-2021 WRX STI models equipped with the EJ257 2.5L DOHC turbo engine including hatchback and sedan variants
  • Q: What alloy and coatings are used on these pistons?
    A: Made from 2618 T6 aluminum alloy forgings with moly skirt coating, accumulator grooves, and nickel wrist pin bores for heat resistance
  • Q: What is included and any warranty details?
    A: Complete set of 4 pistons, rings, wrist pins, and locks included. backed by Manley limited warranty against manufacturing defects

Shipping & Handling

  • Method: UPS Ground or FedEx
  • Availability: In stock - ships same or next business day
  • Packaging: Manley branded box 12in x 10in x 6in
  • Weight: 5 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

×