The ACT MR1-HDSS kit pairs ACT's most popular Heavy Duty pressure plate with ACT's most popular Performance Street disc. The Heavy Duty pressure plate's diaphragm design increases clamp load and reduces deflection to extend clutch life, with every diaphragm undergoing ACT's four-stage heat-treating process and precision cover stampings for rigidity and consistency. The Performance Street disc uses premium organic friction material with high copper content for improved heat transfer and steel-backed lining for greater burst strength, with reduced marcel for faster shift action and increased strength and reliability.
WarrantyInstallation Instructions
Specifications:
- Pressure Plate: Heavy Duty, four-stage heat-treated diaphragm
- Disc: Performance Street, organic friction material, steel-backed lining
- Recommended Use: Street and race use
- Warranty: One-year ACT warranty
- Part Number: MR1-HDSS
Vehicle Applications:
- 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 SE
- 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
FAQ
What's included in the MR1-HDSS kit?
An ACT Heavy Duty pressure plate and ACT's Performance Street organic disc, along with ACT's linked installation instructions and warranty documentation.
What vehicles fit the MR1-HDSS?
2004-2006 Mitsubishi Lancer Ralliart and 2006-2012 Mitsubishi Eclipse (GS, SE, and Spyder GS trims).
Is this kit suited for daily street driving?
Yes, ACT rates the Heavy Duty pressure plate and Performance Street disc combination for street and race use.
What warranty comes with this kit?
ACT backs the MR1-HDSS with a one-year warranty.

