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Part Number: 4001K

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Features & Benefits
- Tuned and matched integrated suspension kit allows for increased comfort and control with or without added weight
- Old Man Emu Nitrocharger Plus struts and shocks
- Twin Tube body for added protection in rough terrain
- 5-position spring seat adjustment with included coil seat spacers, catering to a range of different vehicle setups
- Heavy-gauge steel tube construction for increased strength
- Direct replacement for OE and aftermarket suspension systems
Kit Components
- 4007 Front Coil Spring Set, 1
- 63112 Nitrocharger Plus Shock Rear, 2
- 93000 Nitrocharger Plus Strut Front, 2
- Rear Lift 0 in
- Rear Load 0 lbs
- Front Lift 2 in
- Front Load 0-330 lbs
- Color Yellow
- Design Twin Tube
- Prop 65 No
- Warranty 3 YR
Year | Make | Model | Submodel | Liter | Cylinders | Fuel type | Doors |
---|---|---|---|---|---|---|---|
2007-2014 | Toyota | FJ Cruiser | Base | 4 | 6 | GAS | 4 |
Product Highlights
VERIFY FITMENT
VERIFY FITMENT
A new range of coils (4xxx series) has been developed to suit the adjustable coil seat on the Nitrocharger Plus struts.
NOTE: These new coil springs are not cross-compatible with Nitrocharger Sport struts or OE struts. (Non-coil over applications continue to use the existing range of Old Man Emu coils).
Please verify below.
Old Man Emu Application Guide | Quick Reference Guide - OME Suspension Kits

NITROCHARGER PLUS STRUTS
Old Man Emu Nitrocharger Plus line combines off-road dependability with smooth, on-road driving and affordability. The Nitrocharger Plus line excels at carrying heavy loads, towing, and navigating challenging landscapes, and ensures a customized and responsive ride every time.
Nitrocharger Plus struts are designed to be exclusively paired with vehicle-specific Old Man Emu coil springs while boasting a 5-position spring seat adjustment system, complete with included coil seat spacers.
Crafted by Old Man Emu engineers, each Nitrocharger Plus strut is meticulously tuned to complement the specific coil springs in our range. This dedication results in various options tailored to your vehicle, ensuring optimal performance and comfort.

NITROCHARGER PLUS SHOCK ABSORBERS
Nitrocharger Plus shocks feature a twin-tube body with vehicle-specific damping to minimize body roll, enhance steering response, and deliver a more controlled ride, providing the confidence to navigate any terrain with ease.
Crafted by Old Man Emu engineers, each Nitrocharger Plus strut is meticulously tuned to complement the specific coil springs in our range. This dedication results in various options tailored to your vehicle, ensuring optimal performance and comfort.
HIGH FLOW PISTON
Free-flowing design reduces aeration and high oil temperature, extending shock absorber performance under harsh conditions.
MULTI-DISC COMPRESSION VALVING
Six valving discs allow greater valving options for maximum ride and handling performance.
5-POSITION ADJUSTMENT
Adjustable 5-postion spring seat allows users to adjust load capacity.
NITROGEN GAS
Increases the temperature operating range and improves oil flow through the valving, ensuring optimum performance.
Features

VEHICLE SPECIFIC BUSHES
High-quality, vehicle-specific bushes manufactured from polyurethane and rubber materials for extended life.
5-Postion Adjustment
Adjustable 5-postion spring seat allows users to adjust load capacity.
NITROGEN GAS
Increases the temperature operating range and improves oil flow through the valving, ensuring optimum performance.
HIGH QUALITY OIL
Petroleum-based, high-performance formula designed to resist fade and aeration for improved durability and shock absorber performance.
PISTON ROD
Super strong 18mm induction hardened chrome piston rod is engineered to handle rigours of heavy loads and tough 4x4 touring.
DIRT SHIELD
Impact-resistant, polyamide dirt shield provides additional protection from stone chips and off-road debris.
EXPLORE MORE ABOUT NITROCHARGER
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As the name suggests, the twin tube has a second internal tube inside the shock to separate oil and nitrogen gas. This is a proven technology that works very well but has its limitations around oil volume and tuning capability due to the piston and overall internal volume being smaller due to having to house a second tube. A monotube shock absorber is a single-body design, which utilizes a floating piston at the top of the shock body to separate the oil and nitrogen gas. This allows a much larger amount of oil to be inside the shock absorber, which not only limits the shock fade, but also increases the overall size of the piston. This increase gives our engineers a huge scope for tuning, allowing us to tune your vehicle perfectly.
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Old Man Emu’s Ride Control Engineers spent countless hours designing and testing to ensure Nitrocharger Plus valving is precisely matched to an Old Man Emu coil spring selection that is right for the accessories fitted to your vehicle per your load requirements.
Testing is carried out both in the field with sophisticated data logging equipment and inside the Old Man Emu laboratory using shock dynamometers to ensure durability under all conditions. With Nitrocharger Plus vehicle-specific valving technology, owners will experience ride control and comfort on or off-road.
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WHAT IS COMPRESSION AND REBOUND DAMPING?
Damping refers to the slowing of the shock absorber’s oscillation. This is controlled by a series of valves that slow the movement of the hydraulic fluid through the piston. Valving controls the movement of the pistons both during compression and rebound strokes.
WHAT EFFECT WILL THESE ADJUSTMENTS HAVE ON A VEHICLE?
Adjusting the compression valves affects how comfortable or firm the suspension is when the suspension of the vehicle compresses. Too firm and the vehicle will feel every bump and ripple in the road surface as the shock tries to prevent the spring from freely compressing. Too soft and the ride will become more comfortable, however, more body roll can be felt when tackling corners and the vehicle may nose dive during braking, resulting in less control. The suspension may also easily bottom out on the bump stops.
Adjusting rebound valving impacts the rate at which the shock allows the spring to return to ride height once it has been compressed. Higher rate springs are used to maintain correct ride height when either accessories or greater constant loads are added to the vehicle. When these springs are compressed with greater load, the energy stored within the spring is also greater and requires extra damping control as it rebounds. Not enough rebound control may cause the shock absorber to top out, causing internal damage to the shock, or allow the suspension to bounce numerous times after hitting an obstacle, resulting in less control of the vehicle.
WHICH SHOCK IS RIGHT FOR YOU?
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- You want an affordable upgrade because the OE suspension isn't up to the task.
- You want a general suspension improvement over OE.
- You have general needs like a lift, carrying heavy weights, better vehicle control, better ride, and improved driveability.
- You want a choice between light, medium, and heavy-duty shocks, with three to four spring options.
- You want a set-and-forget set-up. Fit it once and forget about it.
- Reliable and dependable.
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- You're happy to spend a bit more to get improved all-round performance.
- You want all-round comfort in all conditions.
- The vehicle is your daily driver. It doubles as an overland vehicle for extended trips.
- You want the shocks to keep performing when the going gets tough.
- You want a choice between light. medium and heavy-duty shocks, with three to four spring options.
- You're after a set-and-forget suspension.
- Premium materials and a sleek look.
- Adjustable pre-load springs to cater to changing your setup
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- You want the best of the best.
- You want increased control over unexpected events.
- You want comfort and control at speed, customization, and adjustment.
- You need adaptability from on-road to off-road and the ability to tune and adjust the shocks yourself.
- You want long-travel suspension for the most extreme terrain.
- You tend to seek out the harshest and most remote terrains.
- You want a shock that can best handle temperature extremes.
- Adjustable pre-load springs to cater to changing your setup.