What is the advantage of using forged pistons like these?

Forged pistons, like these made from 2618 alloy, are significantly stronger and more durable than cast pistons. This makes them essential for high-performance or racing applications where increased cylinder pressures and temperatures are common.

What does the 9.8:1 dish compression ratio mean for my build?

The 9.8:1 dish refers to the volume of the depression in the piston crown. This ratio, combined with the 83mm stroker crankshaft and 99.5mm bore, helps achieve a specific compression ratio for your engine build, influencing power output and fuel requirements.

Are any special tools or components needed for installation?

While these pistons come with wrist pins and locks, you will need appropriate piston rings (sold separately), and it's recommended to have the cylinder bores honed to match the piston size and ring type. Always refer to Manley's installation instructions for detailed requirements.

Specifications

Brand: Manley Performance
Part #: 632500CE-4
UPC: 807298088150

Manley 04+ Subaru WRX/STi 83mm Stroker 99.5mm STD Size Bore 9.8:1 Dish Extreme Duty Piston Set

Name: Manley 04+ Subaru WRX/STi 83mm Stroker 99.5mm STD Size Bore 9.8:1 Dish Extreme Duty Piston Set
Brand: Manley Performance
SKU: manley-performance-manley-04-subaru-wrx-sti-83mm-stroker-99-5mm-std-size-bore-9--t14-4381642
Price: 963.51 USD
Availability: BackOrder

$963.51

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley 04+ Subaru WRX/STi 83mm Stroker 99.5mm STD Size Bore 9.8:1 Dish Extreme Duty Piston Set. Forged from 2618 alloy for superior strength.

Key Features

Fits 2004 and later Subaru WRX and STi models.
Forged from domestic 2618 alloy for superior strength and performance.
99.5mm standard bore size with a 9.8:1 compression dish, ideal for stroker builds.
Includes premium chrome moly wrist pins for added durability.
Features cam and barrel skirt profiles for smooth operation and power generation.
Exacting ring lands and grooves ensure enhanced ring seal and more power.

This piston set is designed for 2004 and later Subaru WRX and STi models. Please verify compatibility with your specific vehicle and engine build.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the engine in your 2004 and later Subaru WRX or STi, especially for a stroker build, a strong set of pistons is crucial. These Manley Extreme Duty pistons are built to handle the demands of a high-performance engine, offering a significant upgrade over stock components. They feature a 99.5mm standard bore size and a 9.8:1 compression dish, designed to work with stroker crankshafts for increased displacement and power.

Manley uses domestic 2618 alloy forgings for these pistons, which are known for their superior strength and durability compared to cast aluminum. This makes them well-suited for engines that see hard use or are built for racing. The pistons also come with premium chrome moly wrist pins, and Manley's unique fixturing process ensures the ring lands and skirt are perfectly square, which helps with proper ring seal and overall engine efficiency. You'll also find cam and barrel skirt profiles that help the piston move smoothly in the cylinder while generating substantial power.

This set includes pistons, wrist pins, and locks, ready for installation. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always recommended to consult with your engine builder or refer to Manley's installation instructions for specific details regarding ring gap, assembly, and break-in procedures.