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Full Tilt Boogie Front IRS Subframe Mount Bolts (99-04 Cobra)

AmericanMuscle no longer carries the Full Tilt Boogie Front IRS Subframe Mount Bolts (99-04 Cobra). Please check out 1999-2004 Mustang K-Members, Subframe Connectors, & Braces for an updated selection.
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Features & Details

  • Eliminate the "Cobra Clunk"
  • Reduces Rear Sub Frame Movement
  • Grade 8 Steel Construction
  • Zinc-Plated
  • (2) 9/16" Bolts with Lock Nuts and Flat Washers
  • Fits 1999-2004 IRS Equipped SVT Cobra Mustangs
Reduce IRS Subframe Movement. The 1999-2004 SVT Cobra's Independent Rear Suspension (IRS) is notorious for moving under acceleration and braking as well as making a banging noise that has been dubbed as the "Cobra Clunk". This is caused by many issues one of them being the undersize 12mm bolt that came installed at the factory. Knowing this Full Tilt Boogie designed their IRS Front Subframe Bolts to be a much thicker 9/16" diameter to help reduce movement and noise.

Quality Construction. Made from specially-engineered Grade 8 carbon alloy steel that features a durable zinc plated finish to resist corrosion, these Full Tilt Boogie IRS Subframe Bolts are hardened to a tensile strength of 150,000 psi to provide superior strength for long-lasting performance.

Application. This Full Tilt Boogie IRS Front Subframe Bolt Kit is designed to be direct upgrade replacement on all 1999 to 2004 IRS equipped SVT Cobra Mustangs. This kit includes (2) 9/16" bolts, (2) Nylon lock nuts and (2) Flat washers.

Fitment: 1999 2001 2003 2004 Details

MPN# FT 1600

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (2) 9/16" bolts
  • (2) Nylon lock nuts
  • (4) Flat washers
Installation Info
Will it fit my Mustang?

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Customer Reviews (3) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Afternoon

  • Handling Improvement 3 3
  • Fit 4 4
  • Bang For Your Buck 3 3

  • 4/5

    August 14, 2017

    Irs rear bolt

    A bit hard to to get to place the nut on the back side. Overall good deal. Then again you could just go to your local hardware store and get a pair.


    Year: 2003 Submodel: Cobra

    Helpful (3)

  • 5/5

    September 11, 2016


    Good fit! Much less play than the stock bolts. Had the IRS out to replace some bushings and reseal the diff. Good time to swap these out.


    Year: 2003 Submodel: Cobra

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    October 01, 2015

    It's a close fit.

    I used these properly sized bolts from FTB to re-install my subframe after replacing the subframe bushings, control arm bushings, and bumping the rear gear up to a 3.90. The bolts are just a tad under the size of the mounting holes. Therefore, lining them up with the mounting holes is a task. I am not going to tell you that I can "feel" a difference. Nevertheless, it is best to have the right size bolt installed to take-up any play. All of the suspension mods that I made have made my Cobra smoother and tighter than factory.


    Year: 1999 Submodel: Cobra Greensboro, NC

    Helpful (4)

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