CP Piston & Ring Set for Subaru EJ257 Stroker - Bore (99.5mm) - Size (STD) - CR (8.5) - Set of 4

Forged from 2618-T61 aluminum, these CP Pistons are built for the demands of a stroker EJ257 engine in your 2004-2012 Subaru Impreza. The 99.5mm bore size is a common choice for those looking to increase displacement, and the 8.5:1 compression ratio is well-suited for boosted applications, offering a good balance between power and reliability when paired with the right tuning and supporting modifications.

CP Pistons are known for their robust construction, designed to handle higher cylinder pressures and temperatures than cast pistons. Each piston in this set is precision-machined to exacting standards, ensuring a consistent fit and performance. The included rings are specifically matched to the pistons and bore size, simplifying installation and ensuring proper sealing for optimal power and efficiency. This set is intended for builders who are pushing the limits of their EJ257 engine and need components that can withstand significant stress.

This set includes four pistons and their corresponding ring sets. It's important to note that these pistons are not CARB approved and cannot be shipped to California. For a successful build, ensure you have the correct machine work done on your block to accommodate the 99.5mm bore and consult with your engine builder or tuner regarding the specific requirements for your application, especially concerning camshafts, cylinder heads, and fuel system upgrades to achieve the desired performance from this stroker setup.