Subaru PowerPak Piston Set 99.750mm Bore 2.5L

The Subaru PowerPak Piston Set 99.750mm Bore 2.5L is purpose-built for builders and enthusiasts who demand premium quality components for engine rebuilds, performance upgrades, or restoration work on Subaru 2.5-liter platforms. These MAHLE pistons represent the gold standard for Subaru engine internals, engineered to deliver reliable power delivery whether you're running stock boost, modest tuning, or more aggressive modifications. When you're investing time and money into a complete engine rebuild, choosing OEM-equivalent pistons from a trusted manufacturer ensures your build will survive real-world driving conditions.

MAHLE pistons are manufactured to exacting tolerances with the 99.750mm bore specification matching Subaru's factory dimensions for 2.5L engines commonly found in models like the WRX, Outback, and Legacy platforms. These forged pistons feature optimized ring grooves, advanced skirt coatings to reduce friction, and thermal design that manages heat transfer efficiently under sustained boost and cylinder pressure. The complete piston set weighs 5.45 pounds and arrives ready for assembly, featuring the precise geometry required for proper piston-to-wall clearance and reliable ring sealing across your target RPM range.

Street turbocharged builds, naturally aspirated stroker engines, and complete block rebuilds all benefit from MAHLE's proven track record in the Subaru community. Professional machine shops and experienced home builders alike specify these pistons because they eliminate the guesswork around piston quality and longevity. Proper installation requires attention to ring gap, piston-to-wall clearance, and correct connecting rod orientation—work best handled by someone experienced with flat-four engine assembly, ensuring your PowerPak pistons perform as engineered for thousands of trouble-free miles.