Mahle Forged Pistons (86.50mm, 10.6cr, Set/4), 2015-2021 WRX

MAHLE Motorsport's PowerPak and PowerPak+ piston kits offer superior reliability and performance, letting you take your build to the next level. Backed by over 95 years of performance experience and using MAHLE manufactured machinery to offer advanced features found nowhere else; make no compromises, trust MAHLE Motorsport.

Included:
• Mahle Forged Pistons (86.50mm, 10.6cr, Set/4), 2015-2021 WRX

Features:
• Slipper Skirt Style Forgings: strong, lightweight, low drag forging superior to the traditional full round design.
• Phosphate Coating: helps prevent microwelding in the ring grooves and pin galling.
• Grafal Anti-Friction Skirt Coating: reduces drag, scuffing, friction, cylinder bore wear, and reduces piston noise.
• Hard Anodized Top Ring Grooves (PowerPak+ Piston Kits): extra protection against ring groove microwelding for extreme duty applications.
• 4032 or 2618 Aluminum Alloy: whether building a street engine or an all out race engine, both 4032 and 2618 alloys are available depending on the application.
• Boxed Strut Construction (Available for the WRX 2.5L STi only): added strength for extreme duty applications.
• Fully-machined crown
• Grafal anti-Friction coating on skirts*
• Phosphate-coated to reduce micro-welding and pin galling**
• Pin bores finished on CNC boring equipment
• Hand deburred
• High strength, light weight German steel pins
• Race-proven round wire locks
• Low drag ring pack
• Light weight slipper skirt forgings
• * MAHLE's GRAFAL skirt coating reduces drag, scuffing, friction and cylinder bore wear; reduces piston noise.