Manley 15+ Subaru FA20 WRX 86.50mm +.5mm Bore 10:1 Dish Piston Set with Rings

If you're rebuilding the engine in your 2015+ Subaru WRX with the FA20 engine, a set of strong pistons is crucial for handling increased power or restoring performance. These Manley Performance pistons are built for that job, using a domestic 2618 alloy that's known for its strength and ability to withstand high temperatures and pressures. They feature a dish design that results in a 10:1 compression ratio, which is a common target for many performance builds. The set includes rings and premium chrome moly wrist pins, making it a comprehensive package for your engine build.

Manley puts a lot of thought into how these pistons work inside the cylinder. They use proven cam and barrel skirt profiles, which help the piston move smoothly against the cylinder wall, reducing wear and noise while still allowing the engine to make good power. The ring lands and grooves are machined to very strict standards to ensure a solid seal from the piston rings, which is key for both power and oil control. This attention to detail, like machining the grooves and skirt in a single operation for ultimate squareness, is why professional engine builders trust Manley.

This set is designed as a 0.5mm overbore, so make sure your cylinders are honed to match this size. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. If you're building a high-performance FA20 engine, these pistons offer a well-built foundation.