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Steeda Supercharger Pulley - 2.81 in. (03-04 Cobra)

AmericanMuscle no longer carries the Steeda Supercharger Pulley - 2.81 in. (03-04 Cobra). Please check out 1999-2004 Mustang Underdrive Pulleys for an updated selection.
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Features & Details

  • 2.81" Diameter Pulley
  • Adds 4-5 PSI Boost
  • Gain Up to 60 RWHP
  • Heavy Duty Steel Construction
  • Fits 03-04 Mustang Cobra
Gain Up to 60+ RWHP. Unleash the monster hiding under your Mustang's hood by replacing your 03-04 Cobra's stock pulley for an amazing 60+ additional horsepower. Steeda's 2.81" pulley adds 4 to 5 pounds of boost in around an hour for performance you'll have to feel to believe.

Legendary Steeda Quality. Unlike other pulleys which are made from flimsy aluminum, Steeda makes this pulley from steel for superior durability. It also features weight-saving holes drilled around the center of the pulley to lower rotational weight.

Application. This Steeda pulley is designed for the supercharged 2003 to 2004 Mustang Cobra.

Note: Coupon codes cannot be applied to this product.

Technical Notes. Custom tuned Chip or Handheld Tuner and shorter serpentine belt required.

Fitment: 2003 2004 Details

MPN# 555-3328

CA Residents: WARNING: Cancer and Reproductive Harm -

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

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Questions & Answers (8)

5 Top Rated Questions

What size belt would be needed or what size idler pulley to make up for the slack.? (Everything stock)

  • When running a 2.81" pulley you will need a shorter serpentine belt to keep tight on your blower for maximum boost. The stock belt size is roughly 75.5". You will need 73.5 " belt.

Helpful (2)

do i absolutely need a tuner? I want to put this pulley on, but all the tuner options are pretty expensive, how important is a tuner for this? Can I put this pulley on with just the shorter serp belt?

  • NO, you have to get a tune - the added boost will likely not be compensated for by the stock computer. The pulley is the least expensive part of the whole job of upping boost. You would need a tuner and possibly a fuel system upgrade. Don't skimp - you could end up needing a whole engine if it detonates and burns pistons or throws a rod out the side of the block!

Helpful (1) Show 4 more answers

What hardware will I need to install it other than the special tool and where can I find the hardware

  • You will need to get a new tune with a smaller belt along with the pulley tool. Everything else would just be basic hand tools.

Helpful (0)

If I just get the pulley, belt, and tuner will i need anything else with that? Im seeing other aftermarket pulleys in these pics.

  • This Steeda Supercharger Pulley will require a different length belt and would indeed require a new tune. Depending on your exact application and its needs, you may need upgraded fueling components as well.

Helpful (0)

What other mods will I need in order for this pulley to work? I know I will need a shorter belt, and I have a tuner already.

  • The Steeda Supercharger Pulley will only need the belt and a custom tune to operate properly.

Helpful (0)
Post Your Question
3 More Questions
Does this 2.81 pulley require a fuel system upgrade? 1 answer
What tuner ot tine do i need i wanna get this pully for my cobra but I was wondering what tuner do I need can I get it from American muscle or what one do I need or can I buy the tuner and air intake kit from American muscle 1 answer
How does the installation of this under drive pulley effect the gas mileage of the vehicle??? 3 answers

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Customer Reviews (15) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 5 5
  • Fit 5 5

  • 5/5

    Installation Time: Afternoon

    October 17, 2018

    Great Buy

    Good way to get a little bump in power for less $$. Pair it with a tune and you'll notice a difference immediately. 13/10 would recommend. Took about 2 hours due to the fact it was my first time swapping a pulley. Buy the puller, it will make a world of difference.


    Year: 2003 Submodel: Cobra

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    April 09, 2018

    It’s a new car...

    Pulley does it’s job. Spins the blower faster makes a lot of power. I bought the Bama tuner, 74.5” belt and the puller. Do yourself a favor, buy the puller and follow the instructions. I turned a 2hr job into a 4hr one. Car makes serious power. I also installed new lower temp Iridium plugs. Breaks tires in 3rd even on low RPM stomp. Gave it high perf gain because it’s noticeably different. Like a new car altogether. 2004 Mystichrome 44k miles


    Year: 2004 Submodel: Cobra

    Helpful (5)

  • 5/5

    Installation Time: Less than 1 Hour

    January 15, 2018


    Paired with a JLT ram air intake, bassani o/r x-pipe, Borla stingers, and a custom dyno tune I made 472 rwhp and 521 ft lbs torque! Awesome numbers for pulley only! Great improvement over stock!


    Year: 2003 Submodel: Cobra

    Helpful (3)

  • 5/5

    Installation Time: Less than 1 Hour

    May 09, 2017


    This is definitely the best bang for your buck power gainer out there for the 03-04 cobras. I put this bad boy on in a matter of minutes and gained a ton of power! I can no longer hook in first or second, and instead of throwing me back in ny seat I'm planted back there through every gear all the way to 7k. Very impressed with the quality, and the army color green it came in is pretty cool. I would recommended this to anyone with a cobra. 12-13lbs of boost after install. Super addicting so see that guage shoot your there. Would recommend getting the pulley puller/install tool to make it easier.


    Year: 2003 Submodel: Cobra

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    July 18, 2014

    A great upgrade for an 03 Cobra

    We were looking for a pretty simple upgrade to boost overall performance and this really did it. Some of the other items we have done are: A quadrant, clutch cable and adjuster.. cold air intake.. MGW shifter (it replaced the Steeda shifter that was OK, but we really like the MGW more).. OEM exhaust with FlowMaster Super 44 mufflers. Our local shop was able to pull and install the new pulley without the $180 tool. This upgrade along with the BAMA tune (we used an SCT tuner) made the car so much fun to drive all over again. It spools up way faster with more boost. I'd have to say that this is a 'must have' upgrade combined with a proper tune. Now to go order some new rear tires.. because I don't think this set will last long. What a blast.


    Year: 2003 Submodel: Cobra Western, NY, USA

    Helpful (4)

  • 5/5

    Installation Time: Afternoon

    January 31, 2014

    Asome product

    Best bang for the buck, combined with the Diablo Sport I- tune 1000 what a difference in the attitude of the car much more aggressive i love it. Terry M.


    Year: 2003 Submodel: Cobra Morgan Hill, CA, USA

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    October 20, 2013

    2.81 upper pulley

    This has been the best bang for the buck item I've put on my car. Using the Steeda pulley puller I had no problems removing the factory pulley and installing the 2.81. I used an Intune tuner to tune for the pulley, JLT CAI, and 93 octane. It builds boost quicker now and feels like a different car.


    Year: 2004 Submodel: Cobra Yellowcobra

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    September 22, 2013

    More boost

    This product really works. I have not dynoed it yet, but I did on another car and achieved a 50 hp increase. Great product, keep it coming. Thanks Tom


    Year: Pre-79 Submodel: Other Rock Hill, SC, USA

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    July 01, 2013

    A must for supercharged cobras

    By far the best and easiest mod ever. After the install and tune My car is a Beast that's ready to dominate the streets.


    Year: 2003 Submodel: Cobra Midland, TX, USA

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    May 18, 2013

    a must for cobra owners

    Simple install with the correct tool. Amazing power gains when tuned. Put down 455/459 on the dyno with this pulley and an off-road x pipe. A must for cobra owners, it's like driving a whole new beast!


    Year: 2003 Submodel: Cobra

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    April 29, 2013


    Great pulley woke up my cobra. Have to get a billet or steeda pulley puller or you will be sitting around trying to figure out how to get this thing off with any other puller. Lol


    Year: 2003 Submodel: Cobra Kenner, LA, USA

    Helpful (3)

  • 5/5

    Installation Time: Less than 1 Hour

    April 24, 2012

    The best and easiest mod for your Cobra

    This pulley is the best bang for your buck if you want more horses from your Cobra. There is almost no difference to the smallest pulley in the market (2.76") in gain. You need a special tool to take the stock pulley off, you cannot find this tool in your local parts store, you can rent it online or take it to a shop which specializes in this kind of mods (renting the tool is cheaper). I recommend getting a blower tensioner with a 100mm idler to minimize slippage of the belt. You need a custom tune to use this pulley, with AM Bama tune the tensioner and other minimal mods my car is another kind of monster. A big gain for the money spent.


    Year: 2003 Submodel: Cobra DFW, TX

    Helpful (3)

  • 4/5

    Installation Time: Less than 1 Hour

    April 22, 2012

    More boost!!!

    The easiest and fastest way to get more boost from your stock supercharger is a smaller pulley. I got almost 60hp with this pulley (must be tuned).


    Year: 2004 Submodel: Cobra Richmond, CA

    Helpful (4)

  • 5/5

    June 01, 2011

    Just right

    LOVE it. YOU MUST HAVE THE $180 TOOL TO INSTALL THIS. 450hp to the wheels now makes this an easy decision.


    Year: 2004 Submodel: Cobra

    Helpful (10)

  • 5/5

    August 25, 2009


    A must for any Cobra owner. This pulley will make you feel like you are driving a totally different car!


    Helpful (15)

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