CP Piston & Ring Set for Mitsubishi 4B11/Evo X Bore (90.0mm)-Size (+4.0mm)-CR (10.0)-Set of 4

This set includes four forged pistons and their corresponding rings, ready to be installed in your Mitsubishi 4B11 engine, commonly found in the Evo X. These pistons are designed for a 90.0mm bore, which is a +4.0mm over size from the factory specification. They feature a 10.0:1 compression ratio, offering a noticeable bump in performance over stock while remaining suitable for pump gas in many setups.

CP Pistons are well-known for their robust construction, and this set is no exception. Forged from high-strength aluminum alloy, these pistons are built to withstand the increased cylinder pressures and temperatures associated with performance engine builds. The +4.0mm over size is ideal for engines that have been bored out to correct wear or to increase displacement for more power. The included rings are specifically matched to the pistons and bore size to ensure proper sealing and oil control.

When rebuilding or modifying your 4B11, using a set of quality forged pistons like these is crucial for reliability and performance. They are designed to handle more abuse than cast pistons, making them a popular choice for enthusiasts looking to push their Evo X's engine further. Please note that this specific piston set is not CARB approved and cannot be shipped to California.