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Steeda Blower Belt Tensioner (03-04 Cobra)

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

  • Improves Blower Performance.
  • 100mm Pulley.
  • Billet Aluminum Construction.
  • Sleek Underhood Look.
  • All Hardware Included.
  • Fits 03-04 Mustang Cobra.
Better Performance. Whether you're running a smaller pulley on your blower for bigger boost or just looking for stronger performance from your Cobra, this belt tensioner kit is a great addition to your Mustang. It uses factory mounting points on your engine, adding another tensioner pulley that changes the angle of your supercharger belt and creates more wrap around your blower pulley. The result is more contact area between your supercharger belt and your pulley, meaning less belt slip.

Ideal for Big Boost. If you're running a smaller pulley to dial up higher boost on your Cobra, this belt tensioner kit is a must-have to make sure you're getting the most from your mods.

Premium Quality. This premium quality pulley is made from billet aluminum for durability and a great underhood look.

Complete Kit. This kit includes the 100mm (OEM) pulley, mounting bracket, and all necessary hardware for a hassle-free, straightforward installation.

Application. This belt tensioner kit is designed to fit 2003-2004 Mustang Cobras.

Note: Coupon codes cannot be applied to this product.

Fitment: 2003 2004 Details

MPN# 555-3340

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Pulley
  • (1) Mounting bracket
  • (3) Bolts
  • (3) Washers
Installation Info
Tech Specs
Will it fit my Mustang?

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Questions & Answers (1)

1 Top Rated Question

If I use this tensioner with the Steeda 555-3328 2.80" drive pulley can I get by without replacing the belt?

  • When installing the Steeda Blower Belt Tensioner you would be able to reinstall the same belt.

Helpful (0)
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Customer Reviews (13) Write a Review

Overall Rating 4.6

out of 5 stars

Installation Time:Less than 1 Hour

  • Performance Gain 4.8 4.8
  • Fit 5 5

  • 5/5

    Installation Time: Less than 1 Hour

    November 02, 2017

    Great product

    Nice quality product. Great finish. Easy install. Happy


    Year: 2003 Submodel: Cobra

    Helpful (3)

  • 5/5

    Installation Time: Less than 1 Hour

    May 09, 2017


    Great fit and super easy install. No issues what so ever. Keeps belt tight with the smaller pulley.


    Year: 2003 Submodel: Cobra

    Helpful (3)

  • 1/5

    September 26, 2016

    Bad quality

    I purchased this item to have before my dyno tune date, received this item and immediately called and returned it. The quality of this item sucks! There were small dings on the edges along the pulley and on the chrome mounting bracket. They included RUSTED bolts and screws as the hardware and one of the 13mm bolts didn't even fit inside the bracket. For paying over $150 I'd expect a little more quality finish from them.


    Year: 2003 Submodel: Cobra

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    May 18, 2016

    Steeds Blower Belt Tensioner

    Easy to install and works great. No belt slippage.


    Year: 2000 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    July 28, 2013

    This product is a great fit.

    Fast and easy install , does give the belt much needed tension when changing the size of your supercharger pulley.


    Year: 2003 Submodel: Cobra Congers , NY

    Helpful (4)

  • 5/5

    Installation Time: Less than 1 Hour

    March 22, 2013


    Great part took no time to put on and works great deff a must have for pullie swaps


    Year: 2003 Submodel: Cobra Concord, NC, USA

    Helpful (4)

  • 5/5

    April 27, 2011

    Decent, but bearing failed already.

    Good product over all, but the bearing failed pretty quick. Maybe it was just one of the bad apples, but since its been installed it has a squeal. Other than that, great product.


    Year: 2004 Submodel: Cobra

    Helpful (4)

  • 5/5

    February 08, 2011

    Steeda Cobra Belt Tensioner

    I compared the design and quality of this tensioner to another brand. The Steeda only uses one bearing compared to the two bearings of the other brand. They are both the same bearing number 6203, which is a standard bearing industry wide. So I returned the Steeda in favor of the other brand. Both use CNC process on T6061 Aluminum.

    Ron Turner II

    Helpful (6)

  • 4/5

    January 17, 2011

    Must Have

    This Idler Pulley is a must have if you are going with a 2.8" S/C pulley. Really works awesome and greatly reduces belt slippage. Install is a breeze. My only complaint would be that Steeda switched from black to chrome. A little frustrating when you're trying to keep everything under the hood looking uniform. For that I take one star away.

    Tim Smith

    Helpful (6)

  • 5/5

    October 14, 2010

    Cobra Blower Belt Tensioner (2003-04)

    The tensioner was easy to install, looks good and eliminated belt slip at the blower pulley.

    Art Bouchard

    Helpful (4)

  • 5/5

    August 10, 2010

    Highly Recommended

    Very easy bolt-on. Stops belt slip and loss of horse power. It looks awesome on the car.

    Kris Morrison

    Helpful (4)

  • 5/5

    December 25, 2009

    Belt Tensioner

    Looks good and created more belt wrap around the supercharger pulley.


    Helpful (6)

  • 5/5

    September 25, 2007


    Works great, fits real nice, real nice looking on the car.

    Dave G

    Helpful (2)

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