- 2006-2007 WRX
- 2008-2014 WRX
- 2004-2007 STi
- 2008-2014 STi
- 2015-2021 STi
- 2004-2008 Forester XT
- 2009-2013 Forester XT
- 2005-2009 Legacy GT
- Brand: MAHLE Motorsport
- Manufacturer's Part Number: 930285017
- Superseded From: WRX209917I22
- Condition: New Product
Subaru PowerPak and PowerPak+ Piston Kits
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.
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.
PowerPak feature includes:
Forged piston for performance applications
Grafal anti-Friction coating on skirts*
Phosphate-coated to reduce micro-welding and pin galling**
Pin bores finished on CNC boring equipment
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.
** Phosphate coating provides the grey appearance to the MAHLE piston. This dry lubricant coating (not to be confused with a thermal film coating) provides a lubricant film in the pin bores and ring grooves until the oiling system of the engine reaches operating pressure; particularly useful during the initial start-up or break-in of engines to protect against galling and microwelding. The piston crown is still machineable.
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