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Steeda Supercharger Pulley - 2.65 in. (07-12 GT500)

AmericanMuscle no longer carries the Steeda Supercharger Pulley - 2.65 in. (07-12 GT500). Please check out 2005-2009 Mustang Underdrive Pulleys for an updated selection.

Features & Details

  • Boost Increase of 3-PSI
  • 2.65” Pulley
  • CNC Machined Billet Steel
  • Nickel Plated with Embossed Steeda Logo
  • Made in the USA
  • Fits 2007-2012 Shelby GT500
More Power. The Steeda 2.65" Supercharger Pulley will add an additional 3-PSI of boost (compared to the stock pulley) to your Shelby GT500 for even more tire shredding power.

Superior Materials and Construction. Unlike other competitor's cheap aluminum pulleys, Steeda's Pulley is constructed in the USA from CNC Machined Billet Steel for the ultimate in strength and durability. Embossed with the Steeda logo this pulley is then nickel plated for a striking finish.

Recommended Upgrade. To realize the full power potential that this pulley has to offer, AmericanMuscle recommends a custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Add Even More Power. When combined with the Steeda Cold Air Intake Kit and a custom dyno tune, this Steeda GT500 Supercharger Pulley delivers an increase of over 125 HP and 100ft/lbs of torque at the rear wheels! Choose from the Add-On option above.

Application. This Steeda Supercharger Pulley specifically designed for use on the Supercharged 2007 to 2012 Shelby GT500 Mustang. Factory belt can be reused.

Note: Coupon codes cannot be applied to this product.

Fitment: 2007 2008 2009 2010 2011 2012 Details

MPN# 555-3345

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Supercharger Pulley
Installation Info
Tech Specs
Will it fit my Mustang?

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      Questions & Answers (6)

      5 Top Rated Questions

      Hello. I've got a 2010 Shelby Cobra GT 500. It's already been tuned with the SCT X4 ECU tuner. I'm thinking about replacing the stock pulley as well, with this pulley package. I have three quick questions: (1) Could replacing the stock pulley with this pulley cause problems in trying to pass state emissions inspections? I read somewhere that changing out the pulley can violate federal EPA emissions regulations and cause the vehicle's emissions to exceed state emissions standards. (2) Can I use the SCT X4 ECU tuner that I already have for purposes of the retuning one would do in connection with this pulley change-out? (3) The cool air intake that you've recommended as part of the package deal is only for models up to 2009. Is there a cool air intake available for 2010 models like mine and, if so, could that be substituted as part of this package? (Note: I already have an upgraded K N cool air intake filter.) Thank you in advance for your time.

      • The 2.65" Steeda Supercharger Pulley can be used without a retune, or your SCT X4 can be used for tuning. With this pulley's 3 psi increase in boost, we have not seen any issues with emissions, though if you are in California, or a state that has adopted California emissions, you may require a CARB EO number to pass smog, which this part does not carry. The cold air intake listed is not compatible with the 2010, however the other version of the Steeda Cold Air Intake can be added at the same cost. This part is linked below.

      Helpful (0)

      It seems the Steeda pulley is larger than the factory pulley. How would this make more power? I would think pulleys any larger in comparison to the crank pulley diameter would turn slower.

      • This Steeda Supercharger Pulley is 2.65" measuring smaller than the OEM 3.0" Pulley, allowing the supercharger to spin faster and produce more boost.

      Helpful (0)

      I have a 2008 GT500. My question is what is my factory supercharger pulley size. Do I need a larger idle pulley with the 2.65 pulley? I know 2.50 does require a larger idler pulley. Can I use factory belt with the 2.65 pulley? What would be the psi differences between the 2.65 and the 2.50 cuz doesn't the factory pulley push 8 to 9 psi right? So how much more boost will I get going with one of those two? Thanks!

      • The factory supercharger size on the 2008 GT500 is going to be 2.5" which is smaller than this which is 2.65". You can use the factory belt with the 2.65" pulley but I would recommend a bigger heat exchanger as you are going to want to keep your temps down. My recommendation would be the AFco Pro-Series heat exchanger item #55102. Also to answer your question on the PSI differences, the stock one is around 15-17PSI and with the 2.65" you will see around 18-19PSI depending on the outside temperatures and other mods like say intakes and exhausts. Exhaust work will lower this PSI and the throttle body and cold air intakes can raise the PSI depending on which you choose.

      Helpful (0)

      Will this pulley be compatible with a roush phase 2 blower on a 2008 gt?

      • The Steeda Pulley is only going to be an upgrade for the stock GT500 supercharger. This will not work on any other supercharger systems.

      Helpful (0)

      Any special tool required for Steeda pulley Is there any special tool required to remove the factory pulley?

      • Yes there is a tool made to install the pulley and its made by Steeda also and its a little pricey but it will take the factory pulley off.

      Helpful (0) Show 1 more answer
      Post Your Question
      1 More Question
      Have you got custom tune for this pulley? Hello! I have got K&N Cold Air Intake Kit on my Shelby. If I buy this pulley, can you sell me tune for such kit? How much horsepower will I get in the end? 2 answers

        Customer Reviews (12) Write a Review

        Overall Rating 4.9

        out of 5 stars

        Installation Time:Weekend

        Installation Cost:$100-$250

        • Performance Gain 4.8 4.8
        • Fit 5 5

        • 5/5

          Installation Time: Afternoon

          March 13, 2017

          A lot more boost

          After installing the steeda pulley I'm pushing 12psi of boost and a very noticeable power gain


          Year: 2007 Submodel: GT500

          Helpful (5)

        • 5/5

          Installation Time: Afternoon

          September 13, 2013

          Buy the pulley tool or your wasting your time

          Great website but I wish your site would have told me that I needed a 150 dollar tool to remove the stock pulley or pay your local dealership several hundred more dollars to change it for you if they will. Better yet how about recommending it in the installation section of product page just so we don't get our hopes up about gaining 120 horsepower this weekend when in reality you will not because you just found out that you need a rare tool. Hopefully my post will help sell a few tools if or when you decide to offer them on your site. Good day


          Year: 2007 Submodel: GT500 Capistrano Beach, Dana Point, CA 92624, USA

          Helpful (9)

        • 5/5

          Installation Time: Less than 1 Hour

          July 30, 2013

          You can hear that supercharger now

          Straight up easy to install after you purchase the tool take it off and install it. With this pulley a CAI and a custom tune my car came alive! Well worth the money.


          Year: 2012 Submodel: GT500 Missouri, USA

          Helpful (5)

        • 5/5

          Installation Time: Afternoon

          March 22, 2013

          Totally worth it !

          I purchased this pulley along with a JLT CAI, SCT tuner, and SLP Loudmouths! Between the CAI and Pulley it really makes the supercharger scream ! when the car was stock you could hardly hear the supercharger. This combo made my 2009 Shelby GT500 really come to life ! I thought it made lots of power before the mods but now its way more fun to drive ! I would highly recommend this product for your Shelby!


          Year: 2009 Submodel: GT500

          Helpful (7)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: 0-$100

          March 21, 2013


          This has to be one of the best upgrade parts I have put in. Instant boost gains, quicker throttle response and still able to drive it on a daily bases without worry.


          Year: 2010 Submodel: GT500 Orlando

          Helpful (5)

        • 5/5

          Installation Time: Shop Install

          Installation Cost: $100-$250

          December 23, 2012

          Steeda Supercharger Pulley 2.65in

          This pulley is great! You can feel an increase in power over all RPM's due to the approximate added 3 psi. Its appearance under the hood also looks great with the GT500 supercharger. It also retains the factory belt, and so far I have not experienced any belt slip or other problems since the install. It gives your beast a little bit extra steam in wide open throttle. I would recommend this overall because it can even be used with most supercharger upgrades including whole swaps.


          Year: 2012 Submodel: GT500 Indianapolis, IN

          Helpful (8)

        • 4/5

          Installation Time: Shop Install

          March 24, 2012

          Pulley is well built

          This product is a great add on to get some extra bite from your Stang. Boost level are increased to the said 3-4 psi that Steeda said no bs there. Just make sure you get the idler pulley to pervent belt slippage under acceleration. Due to the added slack in the belt from the smaller pulley. And Am is the best.


          Year: 2008 Fort Hood,Tx

          Helpful (5)

        • 5/5

          Installation Time: Weekend

          March 01, 2012

          good parts

          my friend and i installed pulley and tuner about 3 hours then we went to dino my car pull out 528 wrhp and 509 fwt i am happy with this part .Thanks American muscle and Bama performance


          Year: 2010

          Helpful (3)

        • 5/5

          Installation Time: Shop Install

          February 25, 2012


          With the TUNER, JLT CAI, and this PULLEY! 555RWHP! Dyno sheet under the SCT livewire to prove no BS! WOW JUST WOW. The power AMAZING! Thanks Ryan for helping me with the TUNE from BAMA! Guys are excellent to work with!


          Year: 2007 st.Louis

          Helpful (5)

        • 5/5

          Installation Time: Shop Install

          February 21, 2012

          Worth the money

          Installed this with the Steeda CAI and purchased the Bama tuner with a gain of 120 RWHP and 104 FT/LBS of torque


          Year: 2009 Washington

          Helpful (9)

        • 5/5

          April 27, 2011

          Steeda Supercharger Pulley

          After receiving the pulley, I had my mechanic install it for me. The boost is upped by the quoted 3 psi. The extra power is very noticable. For the little money invested, the extra hp gain is exceptional. Highly recommend this product to anyone trying to get more power from the GT500.

          John Nowell

          Year: 2009

          Helpful (5)

        • 5/5

          January 23, 2009

          STEEDA Pulley

          Myself and a friend installed the pulley as well as the steeda cold air on my 2007 Shelby GT500 over a year ago. I love these parts, my car makes great power and these parts look very sharp.


          Year: 2007 Submodel: GT

          Helpful (14)

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