Mahle MS Piston Set Subaru WRX 2.5L 99.5mm Bore 79mm Stroke Stock Rod 23mm Pin -14cc 9.0 CR Set of 4

If you're rebuilding the engine in your Subaru WRX with the 2.5L engine, Mahle's MS Piston Set is a solid option for getting your build back on the road. These pistons are built for performance, designed to handle the demands of a performance engine build. They feature a 99.5mm bore and are designed to work with stock-length rods and a 23mm wrist pin, making them a direct replacement for many performance applications.

Mahle uses a well-built 2618 aluminum alloy for these pistons, which is known for its strength and ability to withstand high temperatures and pressures. The boxed strut construction adds rigidity, helping to prevent flexing under load. With a -14.1cc valve relief, these pistons are designed to achieve a 9.0:1 compression ratio when paired with a stock rod and stroke, offering an improved power band without sacrificing too much drivability. Each piston weighs in at 403g, keeping rotating mass in check for better engine response.

This set includes four pistons, ready for your engine build. Please note that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.