Mahle MS Piston Set Subaru 2.5L 100.0mm Bore 79mm Stroke 130.5mm Rod 23mm Pin -22cc 8.5 CR Set of 4

If you're rebuilding the engine in your Subaru WRX STI, Forester, or Legacy with the 2.5L engine, this Mahle MS Piston Set is a solid choice for performance and durability. These pistons are forged from 2618 aluminum, a material known for its strength and ability to handle high temperatures and pressures, making them well-suited for boosted applications or high-performance builds. They come with a 100.0mm bore and are designed to achieve an 8.5:1 compression ratio, which is a common target for modified turbocharged engines looking for a balance between power and pump gas drivability.

Each piston in this set measures 79.0mm in stroke, uses a 130.5mm rod length, and features a 23mm wrist pin. The dish volume is -19.3cc, contributing to the overall compression ratio. Weighing in at 417g per piston, they offer a good balance of strength without adding excessive reciprocating mass. This set includes four pistons, ready to be installed in your engine. Remember that these pistons are not CARB approved and cannot be shipped to California.