ACT XT/Perf Street Sprung Clutch Kit, 1990-2005 Mitsubishi Eclipse/Talon/3000GT Platform | MB1-XTSS

The MB1-XTSS kit pairs an ACT Xtreme pressure plate with ACT's most popular Performance Street disc for the shared Mitsubishi/Eagle/Dodge/Chrysler/Plymouth platform that spans the 3000GT, Stealth, Eclipse, Talon, Summit, Expo, Galant, Colt Vista, Laser, and Sebring. The Xtreme pressure plate uses ACT's exclusive diaphragm design and four-stage heat treating to increase clamp load by 50 to 120 percent over stock for the most demanding drivers. The Performance Street disc uses premium organic friction material with high copper content and a steel backing for durability, with reduced marcel for quiet, faster shift action.

Warranty | Installation Instructions

Specifications

• Pressure Plate: ACT Xtreme (four-stage heat-treated diaphragm design, precision cover stampings)
• Disc: Performance Street Sprung (organic friction material, steel-backed)
• Clamp Load Increase: 50-120% over stock
• Balance: Computer spin balanced to within .25 oz-in
• Warranty: 12-Month ACT "Excellence in Performance" Limited Warranty
• Part Number: ACTMB1-XTSS

Vehicle Applications

Confirmed fitment, listed by individual model year:

California Prop 65 Warning: This product can expose you to chemicals including carbon black, glass wool fibers, and silica (in clutch discs), chromium and nickel, which are known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.

Frequently Asked Questions

Are ACT clutch kits balanced?

Yes. Every ACT clutch assembly is computer spin-balanced to within .25 oz-in, tighter than the .50 oz-in typical of stock production clutches, for smoother operation across the RPM range.

Will this clutch increase pedal effort?

ACT pressure plates are engineered for higher torque capacity, so pedal effort typically increases 15-40% with a Heavy Duty pressure plate and 50-80% with an Xtreme pressure plate compared to stock, depending on the application.

Does this clutch need a break-in period?

Organic street discs should be broken in for 300-500 miles of mild, stop-and-go driving before spirited use. Race discs generally only need a few hard slips to lap the surfaces before normal use. Avoid overheating the clutch during break-in, as this can glaze the friction surfaces.

Is this clutch kit repairable or rebuildable?

In some cases a rebuild or repair may be possible after inspection; contact ACT's technical department for guidance, and use a qualified clutch specialist due to the kit's specialized components.