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Crank Pulley Kit - 4lb Boost (03-04 Cobra)

Market Price $479.99 You Save 10% ($50.00)
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  • Item 49707

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    Features & Details

    • Interchangeable Crank Pulley Kit
    • Allows You to Adjust Your Boost Level
    • CNC-Machined Aluminum Construction
    • Includes 8.6" Crank Pulley Ring (+ 4 lbs)
    • Fits 2003 to 2004 SVT Cobra
    Interchangeable Design. The Crank Pulley kit from Metco Motorsports allows you to replace the stock crankshaft pulley and cage assembly with a lightweight aluminum hub that features an interchangeable outer ring. With the kit installed you can adjust your Cobra's boost level at any time by simply changing the outer pulley ring to any of the pulley rings available from Metco, the process is easy and takes just minutes.

    More Power. The Metco Crank Shaft Pulley Kit includes an 8.6" outer pulley that will add an additional 4 lbs of boost (compared to the stock 7.4" pulley) to your SVT Terminator Cobra for even more tire shredding power.

    Application. This Metco Motorsports Crank Pulley Kit is specifically designed for use on the 2003 to 2004 SVT Cobra Mustang equipped with the DOHC 4.6L Supercharged V8 engine.

    Fitment: 2003 2004 Details

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) Crankshaft Hub
    • (1) Outer Pulley
    • (1) Mounting Bracket
    • Installation Hardware
    Installation Info
    Will it fit my Mustang?

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    Questions & Answers (7)

    5 Top Rated Questions

    will this 4# lower work with a 2.81 upper?

    • No not on a factory're just going to overwork it and produce heat.....

    Helpful (1)

    Will this over work the Eaton supercharger if it already has a 2.76 pulley? If so will a aftermarket heat exchanger fix that?

    With an aux idler. And S/C pulley of 2.93 its been Bama tuned and long tube headers. It started stock boost 8. 2.93 Pulley went to 10 psi. Long tube headers an no cats dropped boost back down to 6 to 8psi. Would the metco lower pulley kit bring psi back up to say 10 to 11psi? And if so will it work the blower to hard? Also does it effect assesorys like altanator, cus pulley ratio change?

    • The Metco Motorsports Crank Pulley Kit will increase boost by approximately 4psi, this should put you to 10-12 psi. The reason the boost went down with the long tubes is that the lower restriction causes less pressure, so the airflow increased, but pressure dropped. This kit combined with your other modifications should not overtax the stock Eaton supercharger, however you will be getting close to the max efficient boost level, as after this the heat the Eaton generates starts to outweigh the boost gains, and a more efficient supercharger would work better.

    Helpful (0)

    Do i have to tune the car after intall

    • When installing the Metco Motorsports Crank Pulley Kit it is best to retune the car, or consult with your tuner if a new tune will be required compared to your existing tune.

    Helpful (0)

    The stock crankshaft pulley was damaged on the 2003 cobra engine I'm installing. Will this take the place of the damaged pulley and assembly?

    • The Metco Motorsports Crank Pulley Kit - 4lb Boost will replace your factory damaged pulley.

    Helpful (0)
    Post Your Question
    2 More Questions
    Will the #4 lower pulley work with a ported eaton with a 2.81? What is the normal setup with a ported eaton. 1 answer
    Will this add 4psi of boost on top of the boost added by a 2.81" supercharger pulley? 1 answer

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    Customer Reviews (3) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Afternoon

    • Performance Gain 5 5
    • Fit 5 5

    • 5/5

      Installation Time: Afternoon

      April 02, 2018

      Metro 4lb lower kit

      Fitment was great and looks good. With a new dyno tune it Snatched me about an extra 100hp on my build.


      Year: 2003 Submodel: Cobra

      Helpful (4)

    • 4/5

      Installation Time: Afternoon

      February 23, 2018

      Looks great

      My big advice, don’t do what I did and over estimate yourself, follow the instructions they say to do something and at first your like that doesn’t make since I’ll figure it out on my own and ya ratchets later you realize what they want you to remove one thing before removing crank pulley from your car!


      Year: 2003 Submodel: Cobra

      Helpful (4)

    • 5/5

      August 22, 2016

      Good product

      It was a quick and easy installation and more boost :)


      Year: 2004 Submodel: Cobra

      Helpful (6)

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