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  See more parts for Mazda RX-8
Select the year of your Mazda RX-8:
ACT Flywheel Kit Prolite w/CW03 Mazda RX-8 2003-2012 - 600140-03
ACT Flywheel Kit Prolite w/CW03 Mazda RX-8 2003-2012 - 600140-03 - Image 3 ACT Flywheel Kit Prolite w/CW03 Mazda RX-8 2003-2012 - 600140-03 - Image 2 ACT Flywheel Kit Prolite w/CW03 Mazda RX-8 2003-2012 - 600140-03 - Image 3

ACT Prolite Flywheel Kit w/CW03 (Part #600140-03)

If you're a Mazda RX-7 or RX-8 owner looking to enhance your rotary engine's performance, the ACT Prolite Flywheel Kit w/CW03 (600140-03) is a must-have upgrade. This flywheel kit comes complete with an essential ACT counterweight, designed specifically for various RX-7 and RX-8 applications from 2003 to 2012. The counterweight is crucial for achieving optimal performance when installing the XACT flywheel on your rotary engine, ensuring that your setup is both balanced and efficient.

Why Choose the Prolite Flywheel?

The XACT Prolite flywheel is ACT's lightest offering, engineered for minimal inertia. This design translates to quicker throttle response and faster acceleration—perfect for road racing or rally applications. While it does reduce drivability slightly, the performance benefits are undeniable. The materials used in the Prolite flywheel are strategically distributed to provide maximum strength, exceptional heat tolerance, and rigidity, making it a reliable choice for high-performance driving.

Key Features

  • Dramatically enhances engine response and acceleration; expect mild to moderate gear rattle.
  • Constructed with heat-treated forging for superior strength and durability.
  • Induction-hardened ring gears ensure maximum lifespan.
  • Correct external balance for manual shift engines using the OE front counterweight.
  • Forged, CNC machined, and dynamically balanced for reliable high RPM performance.

Technical Specifications

  • Material: Chromoly Steel
  • SFI Rating: 1.1
  • Replaceable Friction Surface: No
  • Engine Balance: External
  • Friction Surface Configuration: Raised
  • Type: Prolite
  • Mounting Hardware Included: Yes
  • Grade Type: Performance
  • Mounting Hole Quantity: 6
  • Weight: 15.8 lbs
  • Tooth Quantity: 125
  • Friction Surface Diameter: 9.4 in

Installation Notes

  • This flywheel requires the included counterweight.
  • Flywheel bolts (M10-1.25 x 20mm) and counterweight bolts (M8-1.0 x 20mm) are included.

Customer Feedback

One RX-8 owner shared, "After installing the ACT Prolite Flywheel, I noticed a significant improvement in throttle response. The car feels much more lively, especially when accelerating out of corners. The counterweight was straightforward to install, and I appreciate that it came with all the necessary bolts." This upgrade has made a tangible difference in my driving experience!"

Fitment

This flywheel kit is compatible with:

  • Mazda RX-8 (2003-2012)

For those serious about maximizing their RX-7 or RX-8's performance, the ACT Prolite Flywheel Kit w/CW03 is an investment that pays off with every drive. Whether you're hitting the track or just enjoying spirited drives, this flywheel will help you get the most out of your rotary engine.

Other Part Numbers:
ACT #act600140-03

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2003-2012
 Mazda RX-8

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ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

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.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

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:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

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.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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