Wiseco Mitsu Evo 4-9 HD2 Asymmetric Skirt Gas Ported Bore 85.25mm - Size +.010 - CR 10.5 Piston Set

If you're building a serious performance Mitsubishi Evo 4-9 with the 4G63T engine, this Wiseco HD2 piston set is designed to handle extreme conditions. These aren't your average pistons; they're forged from 2618 aluminum right here in the USA, giving them improved tensile strength for demanding race applications. The asymmetric skirt design, combined with a special ArmorGlide skirt coating, helps reduce friction and resist seizure, while gas ports and precision ring grooves work together to improve ring seal and keep combustion gases in check.

Wiseco has packed these pistons with features for heavy to severe duty use. You'll find a fully machined crown, forced pin oiling to keep the wrist pins lubricated, and anti-detonation grooves to help prevent damage under high boost. The set includes premium rings, and the pistons are machined to a precise 85.25mm bore size, which is 0.010 inches larger than stock, with a 10.5:1 compression ratio. This level of detail means they're built to withstand the rigors of competitive racing.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For builders aiming for maximum performance and durability in their Evo's engine, this Wiseco set is a well-built option.