Supertech Subaru WRX 92.5mm Bore 8.3:1 CR Coated Pistons - Set of 4 (Use SWF20062-2) (Excl Rings)

If you're building a high-performance Subaru WRX engine, especially one that's going to see a lot of boost, a solid set of forged pistons is a critical component. These Supertech pistons are designed to handle the increased cylinder pressures and temperatures that come with a modified engine. They feature a 92.5mm bore and an 8.3:1 compression ratio, which is a common choice for turbocharged applications where you want to run more boost without excessive detonation.

What sets these pistons apart is their construction and coating. They are forged from high-strength aluminum alloy, making them significantly stronger and more durable than cast pistons. This is essential for preventing piston failure under extreme conditions. The pistons also come with a special skirt coating. This coating helps to reduce friction between the piston and the cylinder wall, which can lead to improved engine efficiency and a slight reduction in operating temperatures. This is a detail that experienced builders appreciate, as it contributes to overall engine longevity and performance.

This set includes four pistons, but remember that they do not come with piston rings. You'll need to source those separately, ensuring they are compatible with the 92.5mm bore and the specific ring groove dimensions. It's also important to note that these pistons are not CARB approved and cannot be shipped to California. Always consult with your engine builder or a trusted Subaru specialist to ensure these pistons are the right choice for your specific build goals and supporting modifications.