SKU: 50799346900

PO3-HDR4 - HD/Race Rigid 4 Pad

$405.90 $451.00
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Ships within 48 hours · Estimated delivery Jul 19 - Jul 24

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Description

PO3-HDR4 - HD/Race Rigid 4 PadItem Description: HD Race Rigid 4 Pad Product Weight (lbs.): 14. 1 Torque Capacity (ft lbs.): 670 Torque Capacity Over OE: 74% Disc Material: Ceramic Clutch Disc Diameter (Inches): 9. 4 Clutch Disc Diameter (Millimeters): 240 Input Shaft Diameter (inches): 1 Pressure Plate Type: Heavy Duty Warranty: 12 Months Description: The PO3 HDR4 kit features ACT's popular Heavy Duty pressure plate with an exclusive diaphragm design to increase clamp load, reduce

  • Item Description: HD/Race Rigid 4 Pad
  • Product Weight (lbs.): 14.1
  • Torque Capacity (ft/lbs.): 670
  • Torque Capacity Over OE: 74%
  • Disc Material: Ceramic
  • Clutch Disc Diameter (Inches): 9.4
  • Clutch Disc Diameter (Millimeters): 240
  • Input Shaft Diameter (inches): 1
  • Pressure Plate Type: Heavy Duty
  • Warranty: 12 Months

Description: The PO3-HDR4 kit features ACT's popular Heavy Duty pressure plate with an exclusive diaphragm design to increase clamp load, reduce deflection, and maximize clutch life. The pressure plate undergoes a four-stage heat-treating process for superior performance. Precision cover stampings ensure rigidity and consistency. The 4-pad rigid race discs are made with high-quality ceramic friction materials. The chrome-moly hub is heat-treated for added strength and durability. The lightweight, rigid design enables quicker shifts and trouble-free service. With the 4-pad rigid race disc, engagement is harsher, but shifting is faster. The 4-pad rigid race disc is well-suited for smaller disc sizes in smaller engines.

Description (continued):

  • Feel: Light to moderate pedal effort, aggressive engagement, increased gear rattle
  • Life: Moderate friction life extended by ACT's exclusive diaphragm design; however, the rigid design may increase spline wear
  • Quality: Carefully engineered, precisely assembled, accurately balanced, uses select ceramic friction materials for high heat tolerance and maximum performance
  • Recommended Use: Recommended for race use only
  • ACT Difference: 100% clamp load tested and dynamically computer balanced for smooth high RPM reliability

Vehicle Fitment:

  • Application: Engine
  • 1999 Porsche 911 Carrera 3.4 H6 GAS FI 3400cc
  • 1999 Porsche 911 Carrera 4 3.4 H6 GAS FI 3400cc
  • 2000 Porsche 911 Carrera 3.4 H6 GAS FI 3400cc
  • 2000 Porsche 911 Carrera 4 3.4 H6 GAS FI 3400cc
  • 2001 Porsche 911 Carrera 3.4 H6 GAS FI 3400cc
  • 2001 Porsche 911 Carrera 4 3.4 H6 GAS FI 3400cc

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.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 50799346900

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4.5 ★★★★★
Based on 9 reviews
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Product Reviews
M
Verified Purchase
Mary C. Lucking
Belleville, US
★★★★★ 5
PASSED MY INSPECTION! THIS PRODUCT WORKS LIKE A MIRACLE DONT HESITATE TO BUY IT!
Inspection on my car due the end of January! My check engine light was coming on so I checked with a code reader & found it was a P0420. Read about the Catalytic Converter System possibly being in need of replacement or perhaps clogged. I am a woman, and know next to ZERO about cars, but I can read. Did investigate and found that the replacement of a Catalytic Converter system is mad expensive- also found this Moly Cleaner to add to gas tank. I'm not going to lie; I was nervous as I have a Kia Rio 2014 that has a very small gas tank and gets great gas mileage. In reading the consensus seemed to be to add to 1/4 tank of gas and drive fast for good periods of time to blow out the clog (if it was a clog). Did I mention I live in NYC and driving for long periods of time at high speeds can be a problem because of terrible traffic. Anyhow, this Saturday I poured the can into my 1/2 filled tank and hit a parkway near my home early morning. I did drive for 45 miles sometimes at 80mph then 60mph but tried to do it for a good few minutes at a time without getting pulled over. Checked my reader again, and it was not quite ready but the engine light did stay off. Next day, drove to work, stuck in traffic somewhat & never made it over 20mph & checked my reader again- all good to go for inspection. Went last night- my car PASSED and got that sticker in my window- so I am good for another year. The BEST money I have spent all year. Thank you for carrying this product! Saved me thousands! DONT HESITATE TO USE THIS. The hardest part for me was removing the cap on the can!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 13, 2026
C
Verified Purchase
CLEVEinCR
New York, US
★★★★★ 5
Great stuff
Seemed to work as well as or better than some more expensive catalytic converter cleaners. I put it in while at 1/3 tank and my Check Engine light went out almost immediately once I started driving. My Tundra has almost 230,000 miles and still runs great but was getting a little harder to start after I switched from full synthetic oil to conventional. I’ll never do that again and immediately switched back but the damage was done. Check engine light came on and I had to crank longer to get it started. Adding this Liquid Moly fixed both issues temporarily. I have to wonder if this was used regularly, say every 3 months, if it would clean the catalytic converter more permanently?
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 29, 2025
J
Verified Purchase
Jon.
Charlottesville, US
★★★★★ 3
Ehh??
Didn't work for my on my 17 hyundai accent with 90k on it. I poured the whole bottle in with a half tank of gas. And went for a 3 day italian tune up.... no dice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
J
Verified Purchase
Juan Gonzalez
Houston, US
★★★★★ 5
Works great
Follow instructions and it will work. Had a p420 code, caught it early used this. No more code and passed emissions
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
M
Verified Purchase
Matt Teed
Port Orchard, US
★★★★★ 5
Actually works on BMW!
I purchased this after the shorter black fluted tool I bought last year failed me. This thing is way better constructed, fits perfect , and actually works to turn it after you can’t turn it by hand any further. Was able to get torqued down to 25nm no problem finally with ease!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 12, 2024

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