Wiseco Mitsu Evo 4-9 HD2 Asymmetric Skirt Gas Ported Bore 85.00mm - Size Std - CR 10.5 Piston Set

If you're building a serious performance engine for your Mitsubishi Evo 4-9, this Wiseco HD2 piston set is designed to handle the extreme demands of racing. These aren't your average pistons; they're forged from 2618 aluminum right here in the USA, giving them the improved tensile strength needed for heavy and severe duty applications. The 85.00mm bore size and 10.5:1 compression ratio are specific to certain performance builds, so make sure this matches your engine's requirements.

Wiseco has packed these pistons with features to ensure durability and performance under pressure. You'll find precision ring grooves, anti-detonation grooves, and other features aimed at improving ring seal. The asymmetric skirt design, combined with a special ArmorGlide skirt coating, helps reduce friction and noise while also resisting seizure. Plus, forced pin oiling ensures the wrist pins stay well-lubricated, a critical detail for high-RPM operation. The fully machined crown means a clean, consistent combustion chamber shape.

This set includes four pistons, ready to be installed in your 4G63T engine. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For any high-performance build, always refer to the manufacturer's installation instructions for proper fitment and assembly procedures.