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Weight Myths: SN95 K-member and Front Suspension

There are lots of numbers floating around about how much weight you can save when installing an aftermarket K-member, front control arms, and coil-over kit on the front of a Mustang. Although we've long heard the oft-cited, greatly exaggerated range of "between 75 and 100 lb," no one has ever published an accurate analysis of the achievable weight reduction.

Until now.

Below is a list of the stock Ford parts that are replaced with the typical aftermarket K-member installation in an SN95 Mustang. There are small differences in the weight of some of the stock parts, depending upon the year of the car. In this example, all of the parts listed are from a 2003 Mustang Cobra.

Stock 2003 Cobra Convertible Parts Weight (lb)
K-member 52.25
Front control arms 14.5 each
Coil springs 9.76 each
Front spring isolators (all 3 pieces) 1.1 per side
Upper strut mounts 2.52 per side
Steering rack bushings 0.414 per side
Outer tie rod-ends 1.27 each
Total 111.4

 

Below is a list of the MM parts installed as part of an SN95 chassis K-member installation.

MM Parts for Mod-motor SN95 Weight (lb)
MM K-member 39.5
MM Tubular Front Control Arms 8.445 each
Hypercoil 2.5" springs (8" x 425lbs/in) 3.41 each
MM Caster Camber Plates 3.125 per side
MM Coil-over Kit (for Koni) 1.0 per side
MM Steering Rack Bushings 0.187 per side
MM Outer Tie-Rod End Bumpsteer Kit 1.47 each
Total 74.8

 

This particular combination of MM parts for an SN95 chassis Mustang provides a weight reduction of 36.6 lb.

Could more weight be removed?
Sure, there are companies that make lighter-weight K-members, dropping as much as an additional 18 lb. The potential weight reduction of 54 lb is still a far cry short of the often claimed 75-100 lb reduction.

But...
Keep in mind that the K-member is a mission-critical part that:

  • Provides the load path into the chassis for forces from the front suspension, and it should do so without flexing. When the K-member flexes it affects ride quality, handling, braking, and long-term durability.
  • Supports the weight of the engine.
  • Resists the reaction to the engine's torque output.

There are reasons why Ford didn't make the stock K-member lighter; it weighs what it does because it provides optimum strength and durability. The same goes for MM K-members. We designed each to last the life of your car, while providing you with improved performance for the entire time.

MM K-members for Mustangs