Wiseco Mitsu Evo 4-9 4G63 Asymmetric Skirt Bore 85.00mm - Size STD - CR 9.5 (Single Piston)

Forged from 2618 aluminum right here in the USA, these Wiseco pistons are built for the demands of serious racing and performance builds. They're designed for Mitsubishi 4G63 engines found in Evo 4-9 models, with a bore size of 85.00mm and a compression ratio of 9.5:1. This specific piston features an asymmetric skirt design, which helps reduce friction and noise while improving its resistance to seizure, thanks to the ArmorGlide skirt coating.

Wiseco didn't stop there. You'll find precision ring grooves, an anti-detonation groove, and other features aimed at improving ring seal, all contributing to better performance and durability under heavy load. The fully machined crown and forced pin oiling are also key details that show these pistons are made for tough duty. If you're rebuilding the top end of your Evo and need a strong, well-built piston that can handle severe use, this Wiseco Professional Series piston is a solid option.