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ACT HD/Race Rigid 4 Pad Kit Audi A4 | Volksawgen Passat 1997-2005 - AA1-HDR4

ACT AA1-HDR4 Heavy Duty Clutch Kit

The ACT AA1-HDR4 Heavy Duty Clutch Kit is designed for performance enthusiasts who demand reliability and strength from their clutch system. This kit features ACT's renowned Heavy Duty pressure plate, which employs a unique diaphragm design to enhance clamp load while minimizing deflection. This means you get a longer-lasting clutch that can withstand the rigors of aggressive driving.

One of the standout features of the AA1-HDR4 is its four-stage heat-treated diaphragm, ensuring exceptional performance under pressure. The pressure plate itself is crafted with precision cover stampings, providing the rigidity and consistency required for high-performance applications. Customers have noted that this clutch kit offers a noticeable improvement in shift responsiveness, making it a popular choice among racing enthusiasts.

Features & Benefits:

  • Light to moderate pedal effort with aggressive engagement, perfect for spirited driving.
  • Moderate friction life, enhanced by ACT's exclusive diaphragm design, although some users have reported increased spline wear.
  • Constructed with high-quality ceramic friction materials for superior heat tolerance and performance.
  • Ideal for race applications, providing the performance edge you need on the track.
  • Each unit is 100% clamp load tested and dynamically balanced for smooth operation at high RPMs.

Specifications:

  • Clutch Disc Diameter: 9 in (228 mm)
  • Disc Material: Ceramic
  • Input Spline Quantity: 23
  • Input Shaft Diameter: 0.9375 in
  • Product Weight: 11.4 lbs
  • Torque Capacity: 360 ft/lbs
  • Pressure Plate Type: Heavy Duty
  • Release Bearing Included: Yes
  • Alignment Tool Included: Yes

Installation Notes:

For detailed installation instructions, CLICK HERE.

Customer Feedback:

Many users have shared their satisfaction with the AA1-HDR4, highlighting its quick engagement and improved shifting capabilities. One customer remarked, "I noticed a significant difference in my car's responsiveness after installing this clutch. It feels like a whole new ride!" However, it's worth noting that some have mentioned the increased gear rattle, which is typical for performance-oriented clutches.

Compatibility:

This clutch kit is compatible with:

  • Audi A4 (1997-2005)
  • Audi A4 Avant (1998-2001)
  • Audi A4 Quattro (1997-2005)
  • Volkswagen Passat (1998-2005)

Important Notes:

This clutch kit must be used with the SACHS dual-mass flywheel #DMF91115 for optimal performance.

Other Part Numbers:
ACT #actAA1-HDR4

Proposition 65

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

Vehicle
1997-2005
 Audi A4
1998-2001
 Audi A4 Avant
1997-2005
 Audi A4 Quattro
1998-2005
 Volkswagen Passat

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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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