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

Item 49707
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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

      MPN# ICPCOBRA1-4

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (4)

      Write a Review

      Ratings Summary

      4.5 out of 5 overall rating from 4 customers

      Installation Time: Full Day

      • March 18, 2019

        4 2004 Cobra - Slowbra Installation Time: Weekend

        Boost pulley

        Install was easy the hard part was getting the factory crank pulley off. That was no simple task also you will need a 1400foot pound impact to brake it free. Only other thing is American muscle needs to add belt size chart to this product.

        Helpful (2)
      • April 02, 2018

        5 2003 Cobra - Hunter Installation Time: Afternoon

        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.

        Helpful (7)
      • February 23, 2018

        4 2003 Cobra - mtidball Installation Time: Afternoon

        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!

        Helpful (7)
      • August 22, 2016

        5 2004 Cobra - Redfire

        Good product

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

        Helpful (9)

      Questions & Answers (8 answers)

      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 (3)

      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 (1)

      Already have a 2.8 upper, will this require bigger injectors?

      • This would not require bigger injectors no.

      Helpful (0)

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

      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)
      Post Your Question
      3 More Questions
      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? 1 answer
      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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Crankshaft Hub
      • (1) Outer Pulley
      • (1) Mounting Bracket
      • Installation Hardware

      Will It Fit My Mustang

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