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Engines and Components› Pistons and Piston Rings

KingTec Racing

4032 Forged Aluminum Piston Set, 100mm Bore, 8.5:1

$499.00 $420.00 Save $79.00

SKU: PEJ25

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In Stock
Ships by Aug 31
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$100 Minimum Order
30 Days Return
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Overview

Manufactured from 4032 forged aluminum, these pistons offer heat resistance and low expansion characteristics. Each piston is pin-fitted, balanced, and inspected before shipping, utilizing precision CNC machining.

This set includes four pistons with a 100mm bore diameter and a 8.5:1 compression ratio. The compression height is 30.7mm, and they come with standard-sized piston pins and piston rings included. These pistons are specifically designed to fit Subaru EJ25 engines, including those found in the Impreza, WRX STI, Forester, and Legacy models.
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Constructed from 4032 forged aluminum, these pistons provide superior heat resistance and exhibit low expansion characteristics, crucial for engine stability under extreme conditions. Each piston undergoes a meticulous process of being pin-fitted, balanced, and inspected prior to shipping. The use of precision CNC machining technology ensures exceptional quality and an extreme level of accuracy. This set includes a quantity of four pistons, each with a 100mm bore diameter and a compression ratio of 8.5:1. The compression height measures 30.7mm, and the set comes complete with standard-sized piston pins and piston rings. These high-performance pistons are a direct fit for several Subaru EJ25 engine applications. They are compatible with the Subaru Impreza EJ25 engine, Subaru Forester EJ25 engine, Subaru WRX STI EJ25 engine, and the Subaru Legacy EJ25 engine, making them an ideal upgrade for enthusiasts looking to enhance their vehicle's engine performance.

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

BrandKingTec Racing
Part NumberPEJ25
CategoryEngines and Components

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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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