For the dedicated driving enthusiast, the ACT MS1-XXG4 is more than just a clutch kit; it's a performance upgrade that transforms your vehicle's handling. Designed with the serious racer in mind, this kit features the innovative MaXX pressure plate, which employs a unique diaphragm design. This design not only boosts clamp load but also minimizes deflection, ensuring longer clutch life and enhanced performance under pressure.
One of the standout features of the MS1-XXG4 is its four-stage heat treatment process applied to the diaphragm. This meticulous approach guarantees exceptional performance, even in the most demanding conditions. Customers have noted how the pressure plate's precision cover stampings provide the rigidity and consistency needed for high-stakes racing.
The included 4-pad spring-centered race disc is engineered to dampen torsional vibrations, resulting in quieter operation while resisting failure during intense use. Users have reported that while the engagement may feel harsher, the trade-off is quicker shifts, making it an ideal choice for those looking to maximize their vehicle's performance on the track.
Many users have shared their experiences, highlighting the MS1-XXG4's ability to handle high horsepower applications with ease. One satisfied customer remarked, "The engagement is aggressive, but I love how quickly I can shift now. It really makes a difference on the track!"
Another user mentioned, "I was impressed with the build quality and how well it performed during my last race. Definitely worth the investment!"
This clutch kit is confirmed to fit:
For those looking to upgrade their clutch system, the ACT MS1-XXG4 is a reliable choice that delivers on performance and durability. Experience the difference for yourself!
Other Part Numbers:
ACT #actMS1-XXG4
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
1987-1989 Chrysler Conquest |
Conquest | 1987-1989 |
|
1983-1989 Mitsubishi Starion |
Starion | 1983-1989 |

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.
ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.
Why ACT? Because Power Without Control Is Useless.ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.
Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.
What ACT Offers:ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.
Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.