Action Clutch 04-21 Subaru WRX STI 2.5L (EJ257) Turbo AWD Stage 2 Clutch Kit (1SC)

STREET/TRACK APPLICATIONS (OCCASIONAL TRACK USE – CIRCUIT / TIME ATTACK / ROAD RACING) The Super Copper Kit brings a new level of performance to the street and track. It’s built with the highest copper content you’ll find in any organic clutch on the market — giving you a better grip than OEM, better heat tolerance, and more consistent performance on and off the track. Backed by a reinforced steel plate and a copper-loaded organic facing, it’s designed to hold more power without giving up smooth street drivability. This kit uses our reinforced steel-backed, copper-loaded organic disc paired with a heavy-duty single diaphragm pressure plate — delivering smooth engagement you can daily drive, and the grip you need when you push it. It’s the ideal setup for stock, tuned street cars and basic bolt-on builds that want more without giving up drivability. Like all of our sprung kits, the Super Copper features our patented fully enclosed spring retainer system — protecting you from failures that can cause serious transmission or engine damage, a problem we guarantee you’ll see with other brands. Every kit is hand-assembled and signed off after multiple quality checks by our senior engineering team (50+ years combined experience), making sure you’re getting real, tested performance — not guesswork. Stage 2 Clutch Kit (1SC) for Subaru WRX STI 2004-2021 2.5L DOHC (EJ257) Turbo AWD Includes ACT Monoloc

The Action Clutch Stage 2 Super Copper Clutch Kit, part number ACR-1803-884006P, is designed for Subaru WRX STI models equipped with the 2.5L DOHC EJ257 turbocharged engine and all-wheel drive. Developed for street vehicles with occasional circuit, time attack, or road racing use, this kit delivers increased holding power and improved heat tolerance compared with a factory clutch while maintaining smooth, predictable drivability.

The Super Copper Kit uses a reinforced steel-backed, copper-loaded organic clutch disc paired with a heavy-duty single-diaphragm pressure plate. Its high copper content enhances grip and thermal performance, making it suitable for stock, tuned, and basic bolt-on Subaru WRX STI builds that require more capacity without the harsh engagement commonly associated with aggressive racing clutches. The organic friction material supports comfortable daily driving while providing consistent engagement during spirited use.

Action Clutch equips this sprung clutch kit with its patented fully enclosed spring retainer system. The design helps protect the disc springs from damage and reduces the risk of failures that can contribute to transmission or engine damage. The included ACT Monoloc further supports secure clutch operation under increased load. Each kit is hand-assembled and inspected through multiple quality-control checks by Action Clutch's experienced engineering team.

Application: Street and occasional track use, including circuit, time attack, and road racing.
Compatibility: Select 2004-2021 Subaru WRX STI models with the 2.5L EJ257 turbocharged engine and AWD drivetrain. Verify vehicle fitment before ordering.
Installation: Professional installation is recommended, with inspection of related clutch, flywheel, hydraulic, and transmission components before installation.
Notice: This automotive product may contain chemicals known to the State of California to cause cancer or reproductive harm.

Features:

• Copper-loaded organic clutch disc provides improved grip and heat tolerance over OEM-style friction material
• Heavy-duty single-diaphragm pressure plate increases holding capacity while preserving smooth street engagement
• Reinforced steel-backed disc supports reliable performance in tuned and bolt-on applications
• Patented fully enclosed spring retainer system helps protect disc springs from damaging failures
• Includes ACT Monoloc for secure operation under increased clutch loads
• Designed for street use with occasional circuit, time attack, or road racing applications
• Hand-assembled and inspected through multiple quality-control checks by Action Clutch engineers

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 2013
Subaru Impreza WRX STI 2014
Subaru WRX STI Base 2015
Subaru WRX STI Base 2016
Subaru WRX STI Base 2017
Subaru WRX STI Base 2018
Subaru WRX STI Base 2019
Subaru WRX STI Base 2020
Subaru WRX STI Base 2021
Subaru WRX STI Launch Edition 2015
Subaru WRX STI Limited 2015
Subaru WRX STI Limited 2016
Subaru WRX STI Limited 2017
Subaru WRX STI Limited 2018
Subaru WRX STI Limited 2019
Subaru WRX STI Limited 2020
Subaru WRX STI Limited 2021
Subaru WRX STI S209 2019
Subaru WRX STI Series.HyperBlue 2016
Subaru WRX STI Type RA 2018