Bushing Replacement Kit - Ford Mustang - 4.18121

  • 4.18121 HyperFlex Master Kit Ford Mustang 99-04
  • 4.18121 HyperFlex Master Kit Ford Mustang 99-04
  • 4.18121 HyperFlex Master Kit Ford Mustang 99-04
  • 4.18121 HyperFlex Master Kit Ford Mustang 99-04
  • 4.18121 HyperFlex Master Kit Ford Mustang 99-04

HyperFlex Master Kit Ford Mustang 99-04

Manufacturer: Energy Suspension
Part Number: 4.18121


Free Lifetime Warranty Upgrade
Price: $395.26

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Suggested part for 4.18121: 4.1130
4.1130 Motor and Transmission Mount Combo - V8 4.6L Engine Only
Combo Kit - Motor and Transmission Mounts

Suggested part for 4.18121: 4.1128
4.1128 Transmission Mount - V8 4.6L Engine
Transmission Mount

Suggested part for 4.18121: 4.1127
4.1127 Motor Mounts 99-04 Mustang - V8 - 4.6 Engine ONLY
Motor Mounts

  • Energy Suspension warrants its products against defects in workmanship and material for 7 years or 750,000 miles when used on passenger cars and light trucks. Products that have been abused, altered, or incorrectly installed are not covered. Energy Suspension will replace defective products or component parts, if inspection for factory personnel determines the part to be defective. Warranty replacement covers only the product. Labor claims, time loss, or freight charges will not be honored.
Cross Reference from 4.18121 to 62025
Prothane 62025
Price: $370.71
Warranty: Lifetime Warranty

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FitmentHyperFlex Master Kit Ford Mustang 99-04 4.18121 fits these vehicles:
Hyperflex Master System Kit
It's Energy's System To Get The Very Maximum In Performance and Durability From Your Vehicle!

Bushing Replacement Kit - Ford Mustang - 4.18121

1999 - 2004 Ford Mustang
Except Cobra with I.R.S.
  • Front Control arm bushings - 4.3144
  • Front End Link Set - 9.8124
  • Front Coil Spring Isolators - 4.6102
  • Rack and Pinion Bushings - 4.10103
  • McPherson Strut Tower Bushings - 4.7114
  • Tie Rod End Boots - 9.13101
  • Ball Joint Dust Boots - 9.13130
  • Rear Control Arm Bushings - 4.3155
  • Rear Coil Spring Isolators - 4.6101
Performance Polyurethane Master Bushing Sets
  • Get real performance, for both on the road and off.
  • Popular performance car, truck and SUV applications.
  • A real must for competition use, or just for that "seat-of-the-pants" fun!
  • Increases vehicle stability and control as well as durability.
  • Reduces wheel hop and traction loss.
  • Proven for many years, by both professional and amateur racers alike.
  • Both restores and improves better than new!
  • Made of Energy's HYPER FLEX performance polyurethane.
  • Heavy duty metal components are used, for increased strength, when applicable
  • One Set Will Cover the Left and Right Side

Energy Suspension HyperFlex Package Kit

Thinking about changing a bushing? Why not replace them all? Energy Suspension Master Kits include the bushings you need to completely revamp your suspension. Positions and parts vary from vehicle to vehicle, but each package contains the bushings that Energy Suspension offers.

Energy Suspension's Hyperflex polyurethane is a firmer bushing than the O.E. Not only does this increase the longevity of the bushing but gives the suspension a boost in handling performance. With a firmer bushing, there will be a slight increase in NVH (noise, vibration and harshness), but most drivers prefer the boost in performance in spite of that. Replacing the entirety of your suspension bushings maximizes your handling and ensures it stays that way for a long time.

Energy Hyperflex Master Kit
Energy Hyperflex Master Kit Rubber

Replacing the Faulty Rubber

O.E. Manufacturer's use of soft rubber bushings when making a car. This is great for dampening noise and vibrations, but not so great for performance or longevity. Once the rubber fails, that quiet and smooth ride will fail as well. Rubber is prone to failure due to wear and tear, UV rays, road grimes, and vehicle oils.

Be sure to use Formula 5

This Package will come with plenty of Energy Suspension's own Formula 5 Bushing Lubricant. Using plenty of grease is the best way to ensure a long lasting part without any squeaking. So be sure to use more than enough lubricant when upgrading your suspension bushings. If you'd like some extra grease just in case, pick up an extra 3 pack or an 8 ounce tube.

Master Kit Formula 5 Gif
Energy Suspension 4.18121

Product Reviews for Bushing Replacement Kit - Ford Mustang - 4.18121

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Energy Suspension 4.18121

3 out of 5 based on 1 user reviews. Write a Review


starstarstarstar_borderstar_border" Very good "

Very pleased with kit.

verified_user Verified Buyer - - . Energy Suspension 4.18121 - 3 out of 5

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  • Bushing Material: Polyurethane

question_answer Customer Questions and Answers

I was wondering the 2 long plastic tubes that come with the 2 front control arm isolators. Where do they go?
Those are polyurethane tubes. They go over the coilspring coils. If the coils collapse and touch they will keep the coils from touching and making noise.