1999-04 Mustang Cobra IRS Brace by BilletFlow

Details   |  Description   |  Customer Photos   |  Reviews
Mustang Cobra IRS Brace (99-04) IRS BRACE BLACK

Prevent 1999-2004 Mustang Cobra IRS leaks & cover cracking with this IRS Cover Brace form BilletFlow!

Item #BFL-4033A

Everyday Low Price: $196.99

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  • Prevents Diff Oil Leaks
  • Prevents Cover Cracking


  • 1018 Steel
  • Laser Cut & Welded
  • Black Powdercoated

What's in the Box

  • (1) Differential Cover Brace
  • (1) Hardware Pack

Made in the USA

Product Description

BilletFlow IRS Brace
The 1999-2004 Mustang Cobra IRS Differential Cover is cast in aluminum, a material prized for its unique property of strength without the weight of steel or cast iron. Yet aluminum is not as flexible as steel, so when you push your Cobra to the limit in the corners or at the drag strip, you may be applying enough force to twist the cover beyond it's ability to flex. Repeatedly doing this causes the cover to fatigue & ultimately crack. You see the signs of this flex early on with the evidence of gear oil leaking from the diff cover seal.

Without resorting to a replacement cover made entirely of steel or iron, BilletFlow designed the steel brace offered here. Installation is straightforward using the supplied grade 8 hardware, and BilletFlow even thoughtfully included a hole to permit easy access to the differential fill plug without the need to remove the brace.

-Fits 1999-2004 Mustang Cobra

Customer Photos (2)

Product Reviews (4)

out of 5 stars
5 stars
4 reviews
5 stars    3
4 stars    1
3 stars    0
2 stars    0
1 star    0

4 of 4 REVIEWS
4 of 4 REVIEWS

4 Stars   A must investment
By on 8/11/2016
Image uploaded by stuart c. A must investment for modindications especially if you're putting more power down then off the factory line. And even more so if you're launching. For half the price of a new Ford racing heavy duty diff cover you can save on fluids and a gasket as well by installing the IRS brace. Have that peace of mind you're protected from exploding differentials. DO IT. Don't be a cheapo and pay for it later and more.

Yes, I would recommend this item to a friend!

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5 Stars   A must with an IRS
By on 5/25/2016
Image uploaded by Matthew  B. Just finished up my IRS swap in to my 90 LX and this BilletFlow brace was a must have! Good quality brace with a nice black finish. All hardware was present and install was easy since my IRS was removed from the car.

Yes, I would recommend this item to a friend!

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5 Stars   Perfect fit
By on 4/13/2015
Had the differential off and this brace went on like a charm, Not a single hiccup. Great fit and looks awesome!

Yes, I would recommend this item to a friend!

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5 Stars   super product
By on 4/7/2014
Great fit. No problems at all followed the instructions and took me about hour and half taking my time.

Yes, I would recommend this item to a friend!

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Vehicle Applications

Ford Mustang - 1999 (99) - 2000 (00) - 2001 (01) - 2002 (02) - 2003 (03) - 2004 (04)

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