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Engines and Components› Pistons and Piston Rings

Manley Performance

Manley 04+ Subaru WRX STi (EJ257) 75mm DE-STROKED 99.5mm STD Bore 8.5:1 Dish Piston Set with Rings

$760.03 $699.23 Save $60.80

SKU: M004 621000C-4

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Overview

The Manley Platinum Series pistons are high-performance forged components designed specifically for the Subaru WRX STi with the EJ257 engine. Crafted from 2618 alloy, these pistons feature proven cam and barrel skirt profiles to ensure optimal engine operation. Equipped with tool steel wrist pins and moly skirt coatings on select part numbers, they deliver exceptional strength, wear resistance, and thermal stability. These pistons are engineered to support increased power and durability, making them ideal for high-performance applications. Their precise construction and premium materials provide reliable performance under demanding conditions, whether on the street or track. Designed for 2004 and newer Subaru WRX STi models with the EJ257 engine, these pistons are a direct upgrade for stock components in high-performance builds. They are suitable for turbocharged engines requiring increased power output and enhanced durability. The set includes pistons and rings, offering a complete solution for engine rebuilds or upgrades. Installation involves standard piston replacement procedures, making them compatible with various tuning and modification projects. These pistons are perfect for professional engine builders and enthusiasts seeking reliable, high-quality components for street, track, or racing applications.
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Part #: 621000C-4

Our signature "Platinum Series" pistons feature 2618 alloy forgings, proven cam and barrel skirt profiles, tool steel wrist pins, and moly skirt coatings on select part numbers. Join the ranks of professional engine builders and tuners who rely on Manley pistons for superior performance and durability.

Features:

  • 2618 Alloy Forgings: We use domestic 2618 alloy forgings, ensuring superior strength and performance.Chrome Moly Wrist Pins: Premium Chrome Moly wrist pins come standard with our Standard Series Pistons. For select SKUs, we offer wrist pin upgrades to 9310 and Turbo Tuff/DLC alloys, providing additional durability.Exacting Ring Lands and Grooves: We adhere to strict standards for piston ring lands and grooves, resulting in enhanced ring seal and more power.Cam and Barrel Profiles: Our pistons boast cam and barrel (skirt) profiles that generate substantial power while being gentle on cylinder walls.Unique Fixturing: Manley's unique fixturing allows for skirt turning and ring groove machining in a single operation, ensuring ultimate ring groove to skirt squareness.

Manley Piston Set, PIST-SUBARU 99.5mm/1.285 CD/DDISH.

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandManley Performance
Part NumberM004 621000C-4

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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