ACT MR1-HDSS Heavy Duty Performance Street Sprung Clutch Kit for Mitsubishi Lancer and Eclipse

MR1-HDSS kit features ACT's most popular Heavy Duty pressure plate and most popular street disc. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's Performance Street discs feature premium organic materials with high copper content for better heat transfer and steel-backed lining for greater burst strength and durability. These discs have reduced marcel for faster shift action to complement ACT pressure plates, with increased strength and reliability. HD/Perf Street Sprung Light to moderate pedal effort, smooth positive engagement, OE to mild gear rattle; Longer friction life, extended by ACT's exclusive diaphragm design; Carefully engineered, precisely assembled, accurately balanced, with premium organic friction materials for heat tolerance and reduced fade; Recommended for street and race use; 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

• "Excellence in Performance", backed by the best one-year warranty in the industry!

The ACT MR1-HDSS Heavy Duty Performance Street Sprung Clutch Kit combines ACT’s popular Heavy Duty pressure plate with a Performance Street sprung disc for dependable engagement, increased holding power, and long service life. Designed for street and race applications, this kit delivers light to moderate pedal effort with smooth, positive engagement and performance characteristics suitable for OE to mildly modified drivetrains.

The Heavy Duty pressure plate uses ACT’s exclusive diaphragm design to increase clamp load, reduce deflection, and help maximize clutch life. Each diaphragm undergoes a four-stage heat-treating process for consistent performance, while precision cover stampings improve rigidity and assembly consistency. The Performance Street disc uses premium organic friction material with high copper content to improve heat transfer, along with steel-backed lining for greater burst strength and durability. Reduced marcel supports faster shift action while maintaining predictable engagement.

Every ACT MR1-HDSS kit is carefully engineered, precisely assembled, accurately balanced, 100% clamp-load tested, and dynamically computer balanced for smooth, high-RPM reliability. The sprung hub design helps provide a refined driving experience with only mild gear rattle under appropriate conditions. This kit is recommended for drivers seeking a durable clutch upgrade for street use, spirited driving, or select race applications. ACT backs its performance clutch systems with a one-year warranty. Fitment includes select 2005–2012 Mitsubishi Lancer and Mitsubishi Eclipse applications; verify the vehicle configuration before installation.

Key Product Specifications & Technical Data

• Brand: ACT
• Part Number: MR1-HDSS
• Clutch Type: Heavy Duty pressure plate with Performance Street sprung disc
• Disc Material: Premium organic friction material with high copper content
• Disc Design: Steel-backed, reduced-marcel sprung disc
• Intended Use: Street and race applications
• Performance Characteristics: Light to moderate pedal effort with smooth, positive engagement
• Quality Testing: 100% clamp-load tested and dynamically computer balanced

What’s Included

• ACT Heavy Duty pressure plate
• ACT Performance Street sprung clutch disc
• Clutch kit components supplied by ACT for the specified application

Features:

• Heavy Duty Diaphragm Design: Increases clamp load, reduces deflection, and helps maximize clutch service life.
• Four-Stage Heat-Treated Diaphragm: Supports consistent performance and long-term durability under demanding conditions.
• Premium Organic Friction Material: High copper content improves heat transfer, heat tolerance, and resistance to fade.
• Steel-Backed Reduced-Marcel Disc: Enhances burst strength and durability while supporting faster, smoother shift action.

Fitments:
2004 Mitsubishi Lancer Ralliart
2005 Mitsubishi Lancer Ralliart
2006 Mitsubishi Eclipse GS
2006 Mitsubishi Lancer Ralliart
2007 Mitsubishi Eclipse GS
2007 Mitsubishi Eclipse Spyder GS
2008 Mitsubishi Eclipse GS
2008 Mitsubishi Eclipse Spyder GS
2009 Mitsubishi Eclipse GS
2009 Mitsubishi Eclipse Spyder GS
2010 Mitsubishi Eclipse GS
2011 Mitsubishi Eclipse GS
2012 Mitsubishi Eclipse GS

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1