Mahle MS Piston Set Subaru 2.5L 99.75mm Bore 79mm Stroke 130.4mm Rod 23mm Pin -22cc 8.5 CR Set of 4

Mahle's 4032 aluminum alloy pistons are a solid choice for rebuilding or upgrading your Subaru 2.5L engine. These pistons are designed with a 99.75mm bore and a 79mm stroke, featuring a 23mm wrist pin and a 130.4mm rod length. The -22cc dish volume contributes to an 8.5:1 compression ratio, which is a common target for modified or performance-oriented Subaru engines that might see higher boost levels or require a more robust fuel mixture.

Crafted from 4032 aluminum, these pistons offer a good balance of strength and thermal expansion properties, making them well-suited for the demands of a performance engine. The specific design details, like the 130.5mm rod length and 23mm pin diameter, ensure proper fitment and geometry within the Subaru EJ25 engine family. Each piston weighs in at approximately 401 grams, contributing to a balanced rotating assembly when installed as a set.

This set includes four pistons, ready for installation in your Subaru WRX STI, Forester, or Legacy with the 2.5L engine. Please note that these pistons are not CARB approved and cannot be shipped to California. It's always recommended to consult with your engine builder or refer to Mahle's installation guidelines for specific assembly procedures and clearances to ensure optimal performance and longevity.