Manley 98+ Subaru WRX (EJ205) 79mm +4mm Stroker 93mm +1mm Bore 8.5:1 Dish Piston Set with Rings

When you're rebuilding the engine in your 2002-2005 Subaru Impreza WRX, you're getting a complete set of four pistons, rings, and wrist pins with this Manley Performance kit. These aren't just stock replacements; they're built for serious performance and durability, using Manley's signature Platinum Series construction. The pistons are forged from 2618 alloy, a strong material chosen for its ability to handle high stress and heat without deforming, which is crucial for boosted engines like the EJ205. They're also designed with specific cam and barrel skirt profiles that help reduce friction and wear on your cylinder walls while still making good power.

Manley puts a lot of attention into the details that make a difference. The ring lands and grooves are machined to very tight tolerances, which helps ensure a solid seal for the piston rings. This improved seal means better compression and less blow-by, translating directly into more power and a healthier engine. They even use a unique machining process that allows them to turn the skirts and cut the ring grooves in one operation, ensuring the grooves are perfectly square to the skirt. This attention to detail helps the pistons work smoothly and efficiently inside the cylinders.

This set is specifically sized for a 93mm bore with a +1mm overbore and a +4mm stroke, giving you a total displacement increase. The 8.5:1 compression ratio is a good balance for boosted applications, allowing for more aggressive tuning while still being manageable. You'll also find premium chrome moly wrist pins included, which are known for their strength. If you're looking to build a robust engine that can handle more power and last, this Manley piston set is a solid choice.