Manley Subaru WRX EJ25 99.75mm -17cc Dish 8.5:1 CR Turbo Tuff Extreme Duty Piston Set w/ Rings

Manley Performance is well-known for building tough engine components that professional builders trust. If you're working on a Subaru WRX with an EJ25 engine and need pistons that can handle serious stress, this Turbo Tuff Extreme Duty Piston Set is a solid choice. These pistons are designed to replace your stock ones with a 99.75mm bore and a dish volume that results in a compression ratio of 8.5:1, which is ideal for boosted applications.

These pistons start with domestic 2618 alloy forgings, which are chosen for their strength and ability to perform under high loads. They feature proven cam and barrel skirt profiles, meaning the shape of the piston skirt is carefully designed to help generate power while also being easier on your cylinder walls during operation. Manley also uses tool steel wrist pins for added durability, and they pay close attention to the ring lands and grooves. Machining these precisely ensures a better seal from your piston rings, which translates directly to more power and better engine efficiency. The unique fixturing Manley uses allows them to machine the skirt and ring grooves in one operation, ensuring they are perfectly square to each other for optimal performance.

This set includes the pistons and rings, ready for installation. Keep in mind that these are not CARB approved and cannot be shipped to California. For serious EJ25 builds, these pistons offer a strong foundation.