Maximum Motorsports 99-04 Cobra Grooved HD Bilstein Shock for MM IRS Coil Over Kits

SKU: MM-GBE5-2959-H0

Manufacturer: Maximum Motorsports

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Maximum Motorsports 99-04 Cobra Grooved HD Bilstein Shock for MM IRS Coil Over Kits

*image is only a representation and may not be accurate

1999-04 Cobra Mustang, Bilstein HD series IRS shock, with groove for coil-over conversion kit, dust boot and integral bumpstop.

If you do not already have, or purchase now, an MM rear coil-over conversion kit, you must add urethane shock eye bushings MMSM-105 to install this grooved rear shock.

Included in this shock's price is a charge for grooving it for a coil-over conversion.

Suitable for both stock-location springs and coil-over conversions. See chart below for spring recommendations.

Heavy Duty (HD) Bilstein Spring Recommendations:

Conventional Spring Sets
MM Road & Track
H&R Race
H&R Super Sport
H&R Sport
Eibach Pro-Kit
Stock Springs

Coil-Over Spring Rates:

475 - 525 lb/in

Firm, yet good ride quality, as is expected of a performance car
Includes a machined groove for a coil-over conversion
Does not include lower eyelet bushings, as urethane bushings are included in an MM Rear Coil-over Conversion Kit. To install without a coil-over kit, order bushing kit MMSM-105
Bilstein struts and shocks are made with patented mono-tube technology
High nitrogen gas pressure prevents oil foaming and resultant fading
Monotube design has better heat dissipation than twin-tube dampers, keeps the oil cooler, and decreases heat-induced damper fade
Velocity-sensitive valving improves ride quality
Each Bilstein strut and shock is tested on a shock dyno
Includes an integral, progressive bump stop
Bilstein struts and shocks include dustcovers
MM Sport series and MM Race series dampers are better suited for more aggressive spring rates.


Heavy Duty (HD) Bilsteins work very well in street applications with a variety of both conventional springs and coil-over conversions. They are designed to deliver the best possible ride quality coupled with impressive street performance. The HD series dampers were not designed for use with overly aggressive spring rates, particularly in coil-over conversions. For dampers more suited to aggressive spring rates, see the MM Sport series and MM Race series dampers.

The HD series rear shocks must have a groove machined in the shock housing to accept the MM rear coil-over conversion kit.

While they are non-adjustable, Bilstein's unique deflective-disc valve design instantaneously self-adjusts to changing road surfaces. Their performance does not degrade with age, usage, or heat, requiring no compensating manual adjustments as with other brands. Bilstein uses a patented mono-tube design that allows for a larger piston size than is possible with a twin-tube damper. The mono-tube design provides better heat dissipation to keep the damper's oil cooler, and decreases heat-induced damper fade. High-pressure nitrogen gas prevents oil foaming and fading. Every Bilstein damper is tested on a shock dyno before leaving the factory to ensure quality.

All Bilstein struts and shocks include dustcovers suitable for use with conventional springs.

Manufacturer Maximum Motorsports

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