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Eibach Pro-Kit, 2003-04 IRS Cobra HT and Convertible

Pricing: $350.00

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Eibach Pro-Kit springs for:

  • 2003-2004 Cobra hardtop and convertible with IRS

Eibach Pro-Kit springs:

  • Lower your Mustang for better appearance
  • Increase the spring rate to reduce brake dive and body roll when cornering
  • Lower center of gravity, improving handling
  • Quicken steering response

Ideal for the daily driver, Pro-Kit Springs employ the very same "Hi-Ten" steel and precise tolerances that Eibach uses for its world-famous race springs. With its moderate increase in spring rate above stock, Pro-Kit springs will enhance your driving experience without bone-rattling side effects.

To order

  • Select the discounted MMT-8 to make the install much easier
  • Select the MMPS pinion snubber for better ride quality
  • Select the front and/or rear spring isolators to reduce NVH
  • Click the Add To Cart button

Pro-Kit springs
These are a moderate progressive-rate lowering spring. At ride height, the rate is less than 10% higher than the stock spring rate. However, the progressive design causes the spring rate to increase as the spring compresses, allowing both a lower rate for very good ride quality and a higher rate as the spring compresses to better limit body roll and brake dive. Excellent for daily driving.

Approximate lowering

  • 2003-2004 Cobra hardtop with IRS: (Front: 1.0", Rear: 1.4")
  • 2003-2004 Cobra convertible with IRS: (Front: 1.0", Rear: 1.4")

For best performance and ride quality these springs should be matched with an appropriate set of struts and shocks. Read the Installation tab.

Related products

  • Spring isolators
  • MMT-8 Spring Installation Tool
  • MMPS short progressive pinion snubber
  • Caster camber plates to ensure proper alignment after lowering
  • Performance struts and shocks


Eibach Pro-Kit springs will:

  • Lower your Mustang, improving appearance
  • Reduce body roll when cornering and nose-dive when braking, because the spring rate is higher than stock springs
  • Quicken steering response because the spring rate is higher
  • Lower the center of gravity


  • Progressive spring rate
  • Made of premium-quality high-tensile alloy spring wire
  • Powder-coated for long-lasting protection and great looks


Mustangs with solid rear axle only; no Cobra IRS.

  • 2003-2004 Cobra hardtop
  • 2003-2004 Cobra convertible

Does NOT fit

  • Mustang with solid rear axle

While 1979-2004 Mustang front springs can be physically installed in all 1979-2004 Mustangs (except SVO front), the amount of lowering in non-listed applications will not be as expected because of the differences in car weight and initial ride height between years and models.



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