CP Piston & Ring Set for Mitsubishi 4B11 Evo X - Bore (87mm) - Size (+1.0mm) - Compression Ratio (9.

This is a set of forged pistons and rings from CP Pistons, specifically made for the 4B11 engine found in the Mitsubishi Lancer Evolution X models from 2008 and 2010 through 2014. These pistons are designed to replace your stock ones when rebuilding or upgrading your engine, offering a robust solution for higher performance applications. The set includes pistons machined to an 87mm bore size, which is 1.0mm over the standard bore, allowing for a slight increase in displacement and potential for improved power output. They are designed with a 9.0:1 compression ratio, a common target for modified engines that balances power with pump fuel compatibility.

CP Pistons is known for making well-built internal engine components, and this set is no exception. Forged from high-strength aluminum alloy, these pistons are significantly stronger and more durable than cast pistons, making them ideal for engines that see hard use or are built for increased horsepower. The +1.0mm overbore size means these are intended for engines that have already been bored out or are being rebuilt with that specific dimension in mind. This is a critical component for anyone looking to enhance the performance and reliability of their Lancer Evolution X's engine.

When installing these pistons, ensure your engine block has been properly machined to the specified 87mm bore and has a smooth finish. It's also important to use the correct piston rings that come with the set and follow the manufacturer's recommended clearances and assembly procedures. Because these are performance-oriented components, they are often paired with upgraded connecting rods and a performance engine tune to maximize their benefits. Please note that this part is not CARB approved and cannot be shipped to California.