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  1. Maximum Motorsports 99-04 Cobra IRS Adjustable Complete Rear Tie Rod Kit - MMIRSTR-2
    $289.97

    IRS Tie-rod and Bumpsteer Kit The stock rear tie-rod is a weak link in the IRS system. An IRS-equipped Mustang with only moderate performance upgrades can easily attain loads high enough to deform a stock tie-rod. When a rear tie-rod deforms, the rear toe setting changes, causing significant handling and traction problems. A drag race style launch can cause significant deformation, and even complete failure, of the stock IRS tie-rod. The MM Tie-rod is more robust than the stock unit, making it more capable of withstanding the rigors of drag racing and open track use. We designed it to be considerably stiffer than stock, so it will not deform or fail as easily as the stock tie-rod. Not Just a Stronger Replacement The MM Tie-rod kit is much more than just a stronger replacement for the stock unit. It has the additional benefit of providing a means to adjust bumpsteer. A Mustang equipped with IRS is more sensitive to rear bumpsteer than it is to front bumpsteer. Even very small changes in the toe setting of the rear suspension can cause instability and asymmetrical handling characteristics. The handling of an IRS-equipped Mustang will benefit greatly from fine-tuning its bumpsteer characteristics. This kit provides the same bumpsteer adjustment at the outer tie-rod end as our MMIRSTR-1 kit. However, this kit also provides the ability to adjust the height of the inner tie-rod pivot. This gives a much wider range of bumpsteer adjustment possibilities. View the expanded details about the MMIRSTR-1 kit for more tech information about bumpsteer specific to the IRS. Also see MM's Bumpsteer Gauge (MMT-4). The MM IRS Tie-rod Kit includes aluminum tie-rods, spherical rod-ends, an assortment of bumpsteer adjustment spacers, and tapered studs for the IRS uprights.

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  2. Maximum Motorsports 99-04 Cobra IRS Tie Rod Conversion Kit - MMIRSTR-3
    $199.97

    Requires previous installation of MMIRSTR-1.

    Do NOT purchase this kit unless you already have the MMIRSTR-1 kit.

    Don't have the MMIRSTR-1? Then purchase MMIRSTR-2 instead of this conversion kit.

    The MMIRSTR-3 conversion kit is for an IRS already fitted with a MM IRS Adjustable Outer Tie-rod End Kit (MMIRSTR-1). This conversion kit upgrades the MMIRSTR-1 bumpsteer kit on your Mustang to MMIRSTR-2 specifications. For more information see each product page.

    Why would I want this MMIRSTR-3 kit? If you already have the basic bumpsteer kit, MMIRSTR-1, and wish to upgrade the stock inner tie-rods to the stronger tie-rods of our MMIRSTR-2 kit, this conversion kit is for you.

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  3. Maximum Motorsports 99-04 Cobra IRS Bump Steer Kit - MMIRSTR-1
    $149.95

    Adjustable outer tie-rod ends for correcting rear bumpsteer to improve handling of IRS-equipped Mustangs.Benefits
    -Allows adjusting bumpsteer to fine-tune the IRS geometry for improved handling.
    -Allows adjusting the bumpsteer curve to tune the IRS' oversteer characteristics.
    -Exclusive MM spacers are stronger than others, will not buckle when the nut is tightened.
    -Assortment of spacers allows precise fine-tuning of bumpsteer.
    -Measurement and adjustment of bumpsteer is recommended during installation.

    Product Features
    -Direct bolt-on installation, no drilling of the IRS spindle.
    -MM-designed tapered stud with rolled threads (not the weaker machined threads found on other tapered studs).
    -Studs are heat treated for maximum strength.
    -Spacer bushings were designed specifically for this kit.
    -Longer spacer bushings are made of thick-wall Chro-Moly steel to ensure they will not buckle when the 5/8" nut is properly tightened.
    -A variety of spacer thicknesses ensure the ability to properly adjust bumpsteer.
    -Anodized aluminum adapter sleeve is threaded to match the stock IRS inner tie-rod.
    -Hex on the aluminum adapter sleeve is easily accessible because it is at the inner end of the aluminum sleeve, clear of the tire.

    Note: Your Mustang will need to have the rear toe setting properly adjusted after installing this part.IRS Bumpsteer Tech
    -Besides the commonly required adjustments to camber and toe, an IRS can greatly benefit from fine-tuning its bumpsteer characteristics. Just as with the Mustang front suspension, the IRS can exhibit undesirable handling behavior due to bumpsteer characteristics.
    -Ford designed the rear suspension to function as a complete system. The static bumpsteer curve was designed to work in conjunction with the compliance of all the rubber bushings in the suspension. When those bushings are changed to a less compliant material, the dynamic bumpsteer curve will change and no longer be what Ford had intended.
    -With the installation of urethane or Delrin suspension bushings there will be far less compliance than there was in the stock rubber bushings, and therefore the alignment changes when the car is driven will be smaller in magnitude. The original stock static bumpsteer curve will no longer allow the same dynamic curve that the car had with the original rubber bushings.
    -While other companies advocate the simple fix of duplicating the 2003 Cobra bumpsteer curve for earlier IRS Cobras, that becomes less and less desirable as the compliance of the OEM suspension is reduced. MM recommends matching the 2003 Cobra static bumpsteer curve only for cars that retain the original factory rubber bushings. And as a starting baseline prior to measuring and adjusting bumpsteer.
    -The MM kit includes instructions to adjust the bumpsteer to match that of the 2003 Cobra.
    -Rear bumpsteer has a much larger effect on the car's handling balance than front bumpsteer has, which is why MM recommends measuring and adjusting the rear bumpsteer on your Mustang as an integral part of your performance modifications.
    -For cars with any performance upgrades, such as springs, IRS subframe bushings, or rear control arm bushings, MM recommends that the rear bumpsteer curve be adjusted to minimize any toe changes with suspension movement. After you test your car with this initial set-up, you may wish fine-tune the handling balance of the car by adjusting the rear bumpsteer curve. Only your continued testing will confirm what works best for your car and your driving style.

    What is bumpsteer?
    -Bumpsteer is the term for the situation when the toe angle of a wheel changes as the suspension moves up and down, such as when driving over bumps, or from body roll during cornering. This happens when the arc that the spindle travels during bump and droop is not the same as the arc of the outer tie-rod end.
    -If the toe changes more than a very small amount, the rear wheels begin steering the car. Bumpsteer is commonly measured and then plotted on an X-Y coordinate graph as a curve showing suspension travel vs. toe change. The resulting curve is an illustration of the bumpsteer characteristics.
    -To measure bumpsteer you will need a bumpsteer gauge. MM's Bumpsteer Gauge is accurate and quite affordable. Learn More

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