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Professional Products Powerforce Harmonic Damper (96-04 4.6L)

Market Price $109.99 You Save 16% ($18.00)
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  • Item 20059
  • MPN# 80011

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Features & Details

  • Street Use
  • Black Anodized Finish
  • 6.8" Diameter
  • Fits 1996 to 2004 4.6L Mustangs
Practically Indestructible. The Powerforce Harmonic Damper features a unique bonding process which adheres the elastomer to the inner diameter of the inertia ring and the outer diameter of the hub with a stronger adhesive making the damper practically indestructible. And this damper features a notch in the back of the rim indicating Top Dead Center (TDC).

Application. This Professional Products PowerForce Harmonic Damper is designed for use on the 1996 to 2004 2 valve and 4 valve 4.6L Mustangs.

Technical Note. When used on 4 valve applications the accessories (alternator, A/C, etc) will spin 3% slower than stock. This harmonic damper is not SFI-approved for track use.

Fitment: 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (1) Harmonic Damper
Installation Info
Will it fit my Mustang?
  • Bullitt - 01
  • Mach 1 - 03, 04
  • Cobra - 96, 97, 98, 99, 01, 03, 04
  • GT - 96, 97, 98, 99, 00, 01, 02, 03, 04

Fits 4.6L V8's Only

Most Helpful Reviews

powerforce damper

I bought this damper to replace my old aluminum piggyback style underdrive crank pulley after the key slot wore through it give you peace of mind knowing that this pulley is solid and built to last im ...

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Helpful (1)


Great product! Works awesome and at an amazing price

Helpful (1)

Overall Rating 4.7 out of 5 stars
Read All 3 Reviews

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4 Questions / 4 Answers

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does this damper can be used with the sr underdrive pulley 96 - mid 01 gt I have just bought the sr underdrive pulley 96-mid 01 gt and my mechanic says that i need a new damper i dont want to buy the oem this one seems to look that can do the work, but i want to know if this damper fit with my new underdrive pulleys thanks


  • Your mechanic is full of it; you don't need to replace your crank pulley to use underdrive pulleys. I've seen over a dozen different types of engines with underdrive pulleys on the stock crank pulley and it worked fine. Now; if your stock crank pulley is in bad shape (as they can get to be after 10+ years), and the rubber is getting brittle or the two halves are beginning to lose their adhesion, which can cause a serious problem down the road, THEN you would want to get a new crank pulley. There's nothing wrong with not wanting another OEM unit, though it would work perfectly well. **This damper will work just fine with your other pulleys.** It's worth noting that if you have a 4 valve engine (you didn't specify what you have, so I don't know), this damper will further underdrive your accessories by another 3%. I didn't see how much the SR pulleys underdrive the accessories, but I'd guess around 10%; that's a pretty standard number. With the additional underdriving going on, you might notice some charging issues at idle - lights dimming, electronics acting funky; the alternator just isn't spinning fast enough to be able to charge the battery. In addition, the water pump may have a harder time keeping the engine cool at idle. Therefore, you may want to raise the idle up about 200rpm to compensate for it if you have the ability to do so - i.e. tuner, etc.


    Helpful (2)

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Can anyone offer advice on how this one compares to the 2001 mustang bullitt damper? I don't want to mix up something since I know the bullitt came under driven and possibly spin something too slow like my water pump. My damper is just at 160k miles and i want to replace it before it starts to go.


  • Hi, This Professional Products Powerforce Harmonic Damper will make accessories spin 3% slower than stock, but since the 2001 Bullitt's alternator pulley and water pump pulley are lager than stock this damper shouldn't cause any problems.

    Chris J

    Helpful (0)

Whould this harmonic damper work with BBK Underdrive Pulleys (96-Mid 01 GT) Item #56007?


  • The damper will not interfere with any pulleys. It should provide your car with more dependability and precision than any factory damper would give you.


    Helpful (0)

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size is this the same size as stock?


  • No, this is smaller and will spin all accessories 3% slower


    Helpful (0)

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Customer Reviews (3) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Afternoon

  • Performance Gain 3 3
  • Fit 4 4

  • 5/5

    Installation Time: Less than 1 Hour

    August 22, 2014

    powerforce damper

    I bought this damper to replace my old aluminum piggyback style underdrive crank pulley after the key slot wore through it give you peace of mind knowing that this pulley is solid and built to last im not afraid to say that this product is better constructed and looks way better than stock can't go wrong with adding it to the list of mods


    Year: 2002 Submodel: GT carlisle pa

    Helpful (1)

  • 5/5

    February 10, 2010


    Great product! Works awesome and at an amazing price

    Jesus Pena

    Helpful (1)

  • 4/5

    Installation Time: Weekend

    March 20, 2012

    Powerforce Performance Damper

    fit perfectly. Timing marks are easy to see. The annoying thing is that you will need a longer serpentine belt . The stock one is too short.


    Year: 1998 Submodel: Cobra Mountain View, CA

    Helpful (0)

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