Wiseco Subaru EJ257 WRX/STI 4v Dish -19cc 100mm Piston Shelf Stock Kit

Professional Series forged racing pistons from Wiseco are no-expense-spared pistons designed for the serious racers and builders. Packed full of custom-level performance and durability features and provided with premium rings, Professional Series pistons are designed and built for use in heavy to severe duty race builds. Remove your limits with Wiseco's Professional Series. Wiseco Subaru EJ257 Piston Set, 100.00 mm Bore, 30.70 mm Compression Height, 0.9055 in. Pin Diameter, Sport Compact, Set of 4.

• Engineered, forged, and machined in the USA from 2618 aluminum for improved tensile strength
• Precision ring grooves, anti-detonation groove, and additional ring seal improving features
• ArmorGlide Skirt Coating: seizure resistant, friction reduction, and quieter operation
• Designed and built to withstand heavy to severe duty performance applications
• Fully machined crown features
• Forced pin oiling

The Wiseco K598M100 Professional Series piston set is engineered for Subaru EJ257 WRX and STI performance builds requiring dependable strength, precise fitment, and advanced ring-sealing performance. Designed for serious racing and heavy to severe-duty applications, this set includes four forged pistons manufactured from high-strength 2618 aluminum and supplied with premium piston rings. The 100 mm bore and -19 cc dish configuration support performance-oriented engine builds while maintaining the quality expected from Wiseco Professional Series components.
Each piston is precision machined with fully machined crown features, precision ring grooves, and an anti-detonation groove to support consistent combustion performance and improved ring sealing. Forced pin oiling helps promote reliable wrist-pin lubrication under demanding operating conditions. Wiseco’s ArmorGlide skirt coating is designed to reduce friction, resist seizure, and help provide quieter piston operation, making this piston set a suitable choice for builders seeking durability without sacrificing performance.
The Wiseco K598M100 piston set is intended for select Subaru Impreza applications, including WRX and STI-based EJ257 builds. Verify bore size, compression height, wrist-pin specifications, cylinder clearance, compression ratio, and complete engine compatibility before installation. This product is intended for competition and performance applications and is not CARB approved. Professional installation and appropriate engine calibration are recommended for reliable results.

Features:

• Brand: Wiseco

• Part Number: K598M100

• Application: Subaru EJ257 WRX/STI sport compact performance engines

• Quantity: Set of 4 pistons with premium piston rings

• Construction: Forged and machined in the USA from 2618 aluminum

• Bore: 100 mm

• Compression Height: 30.70 mm

• Wrist Pin Diameter: 0.9055 in.

• Dish Volume: -19 cc

• Skirt Coating: ArmorGlide coating helps reduce friction, resist seizure, and minimize operating noise

• Ring Sealing: Precision ring grooves, anti-detonation groove, and additional ring-sealing features

• Lubrication: Forced pin oiling supports wrist-pin lubrication in demanding applications

• Durability: Designed for heavy to severe-duty racing and performance builds

• Crown Design: Fully machined piston crowns

Fitment:
Subaru Impreza WRX STI 2004
Subaru Impreza WRX STI 2005
Subaru Impreza WRX STI 2006
Subaru Impreza WRX STI 2007
Subaru Impreza WRX STI 2008
Subaru Impreza WRX STI 2009
Subaru Impreza WRX STI 2010
Subaru Impreza WRX STI 2011
Subaru Impreza WRX STI 2012
Subaru Impreza WRX STI Limited 2007
Subaru Impreza WRX STI Limited 2011
Subaru Impreza WRX STI Limited 2012
Subaru Impreza WRX STI Special Edition 2010