CP Piston & Ring Set for Subaru EJ257 WRX STi - Bore (99.75mm) - Size (+0.25mm) - CR (9.0)

Forged from aerospace-grade aluminum alloy, these CP Pistons are built to handle the demands of a high-performance Subaru EJ257 engine. The 99.75mm bore size, which is 0.25mm larger than stock, is ideal for rebuilding or upgrading your 2004-2012 Subaru Impreza WRX STi. This specific set is designed to achieve a 9.0:1 compression ratio, offering a good balance for street and track use, especially when paired with modifications that increase boost pressure.

CP Pistons are well-known for their robust construction and attention to detail. Each piston in this set is precision-machined to ensure a consistent wall thickness and optimal heat dissipation. The included rings are also selected to work seamlessly with the pistons, providing a solid seal for improved cylinder pressure and power output. This set is a popular choice for enthusiasts looking to refresh or enhance the engine in their Subaru Impreza, providing a strong foundation for increased horsepower and torque.

When installing these pistons, it's important to follow the manufacturer's recommended clearances and lubrication procedures. Proper assembly is key to unlocking their full potential and ensuring long-term reliability. This set is designed as a direct fit for the specified Subaru Impreza models, simplifying the installation process for those undertaking an engine rebuild.