What is the difference between the coilover and divorced rear suspension configurations?

The coilover configuration combines the spring and damper into a single unit, keeping things compact and workable for road and general track use. The divorced configuration separates the two, allowing independent positioning and tuning; the preferred route for dedicated race builds where geometry optimization and setup flexibility take priority over installation simplicity. Nitron offers both so the R3 suits the build rather than forcing a compromise.

What is the practical difference between high speed and low speed compression adjustment?

Low speed compression controls damping response during slow suspension movements; body roll, weight transfer, and braking dive. High speed compression handles the faster inputs; road surface impacts, curbs, and sharp direction changes. Having independent control over both means you can tune body control and mechanical grip separately rather than making one adjustment that affects everything at once.

Why does this kit use piggyback reservoirs at the front and hose reservoirs at the rear?

It comes down to what works best for packaging at each end of the car. Piggyback reservoirs at the front keep things compact where space is tighter, while hose reservoirs at the rear allow the reservoir to be positioned more freely without compromising access to the adjustment circuits.

What is the difference between the OEM wheel size and 11-inch wheel size variants?

The two variants use different foot brackets sized to suit different wheel fitments. The OEM variant is built around standard factory wheel dimensions, while the 11-inch variant accommodates wider wheel setups. Choosing the correct variant depends on the wheel width you are running or plan to run.

Can I run custom spring rates?

Yes. Recommended rates are available for both Fast Road Spec and Track Day Spec configurations, but custom spring rates are available on request.

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Description

Nitron NTR-R3 Coilover Kit for S550 Ford Mustang EcoBoost & GT

The S550 Mustang EcoBoost and GT have the platform to be genuinely competitive on track, but getting there requires suspension that can be tuned with real precision rather than dialed in by approximation. The Nitron NTR-R3 is built for that level of setup work; independent 3-way damping adjustment with separate high and low speed compression control gives drivers and engineers the range needed to properly develop the car across different circuits and conditions. Piggyback reservoirs are fitted at the front and hose reservoirs at the rear, keeping high and low speed compression adjustment accessible at both ends. Coilover and divorced rear suspension configurations are both available to suit different build requirements, droplinks are included so the installation is complete without sourcing additional hardware, and foot brackets are available for both OEM and 11-inch wheel fitments. A large diameter piston and ultra-strong piston rod sit at the core of the design, providing the damping control and feedback that serious setups depend on. The R3 is a proven race winner with lap records across a wide range of international motorsport formulas, and every kit is custom built, custom sprung, and fully serviceable.

Specialized Bi-Axis Hose Fittings

Nitron R3 hose shocks use Nitron’s own 720-degree Bi-Axis fittings exclusively; a proprietary design that makes for clean, precise installation without the compromises that come with conventional end fittings.

Unique Technology

Nitron starts every shock with precision components that go through a thorough design and development process long before final assembly. The modular construction gives engineers the flexibility to approach each application on its own terms, without compromising part quality or how components perform together under real load. Everything is machined to tight tolerances and inspected individually by trained technicians; that standard of quality control runs through every stage of production, not just the end of it. New materials, finishes, and processes go through extensive validation before they’re adopted, with proprietary Nitron technologies built in throughout to produce shocks that consistently hold up against the competition on road and track. That’s the engineering foundation the brand has been built on since 1998.
- Basic Damper Design:
  1. End Eye / Top Mount
  2. Damper Piston & Shim Stack
  3. Shaft / Rod
  4. Floating / Separator Piston
  5. Suspension Oil
  6. Compressed Nitrogen Gas

Bespoke Engineering

Nitron doesn’t adapt a generic damper to fit the S550 Mustang EcoBoost and GT; they engineer one around the platform. Every application goes through a dedicated development process where components, spring rates, and damping characteristics are shaped by the specific platform, not carried over from something similar enough to work. The geometry, weight distribution, and suspension travel of the Mustang are part of the design from day one, not corrections introduced later. That’s the difference between suspension that works with a car and suspension that was purpose-built for it.

Features

Piggyback & hose reservoir types
Coilover or divorced rear suspension types
16 clicks of high compression
26 clicks of low compression
24 clicks of rebound
Preload adjuster
3-way independent adjustment
Full alloy body
Consists of 4 coilovers, reservoirs, hoses, top mounts, and droplinks
Hand made to order
Foot brackets for OEM and 11-inch wheel sizes

Specifications

Coilover Type: NTR-R3
Adjustment Type: 3-way independent
Adjustment: 16 clicks of high compression / 26 clicks of low compression / 24 clicks of rebound
Reservoir Type:
- Front: Piggyback
- Rear: Hose
Rear Suspension Type:
- Coilover
- Divorced
Droplinks Included: Yes
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 628lbs/inch (110N/mm)
  - Rear:
    - Coilover: Data not available
    - Divorced: 900lbs/inch (158N/mm)
- TDS – Track Day Spec:
  - Front: 799lbs/inch (140N/mm)
  - Rear:
    - Coilover: Data not available
    - Divorced: 1000lbs/inch (175N/mm)

Applications

Ford Mustang EcoBoost: S550 | 2015-2023
Ford Mustang GT: S550 | 2015-2023

Other Suspension Kits for S550 EcoBoost / GT

Notes

Custom spring rates also available, please contact us directly here for more information or for a consultation on custom rates
Images used for illustration purposes only. Specific details, finishes and end fittings may differ from that shown.

Frequently Asked Questions

What is the difference between the coilover and divorced rear suspension configurations? The coilover configuration combines the spring and damper into a single unit, keeping things compact and workable for road and general track use. The divorced configuration separates the two, allowing independent positioning and tuning; the preferred route for dedicated race builds where geometry optimization and setup flexibility take priority over installation simplicity. Nitron offers both so the R3 suits the build rather than forcing a compromise.
What is the practical difference between high speed and low speed compression adjustment? Low speed compression controls damping response during slow suspension movements; body roll, weight transfer, and braking dive. High speed compression handles the faster inputs; road surface impacts, curbs, and sharp direction changes. Having independent control over both means you can tune body control and mechanical grip separately rather than making one adjustment that affects everything at once.
Why does this kit use piggyback reservoirs at the front and hose reservoirs at the rear? It comes down to what works best for packaging at each end of the car. Piggyback reservoirs at the front keep things compact where space is tighter, while hose reservoirs at the rear allow the reservoir to be positioned more freely without compromising access to the adjustment circuits.
What is the difference between the OEM wheel size and 11-inch wheel size variants? The two variants use different foot brackets sized to suit different wheel fitments. The OEM variant is built around standard factory wheel dimensions, while the 11-inch variant accommodates wider wheel setups. Choosing the correct variant depends on the wheel width you are running or plan to run.
Can I run custom spring rates? Yes. Recommended rates are available for both Fast Road Spec and Track Day Spec configurations, but custom spring rates are available on request.

About Nitron Suspension

Nitron Suspension has been at the forefront of precision suspension engineering since 1998, founded by Guy Evans with the goal of building high-performance shocks for enthusiasts and professionals alike. Over 200 dealers now carry Nitron products across Europe, Asia, the US, Australasia, and Africa. In 2008, the company moved into a dedicated facility in the UK’s Motorsport Valley, adding dynamometers, 5-axis CNC machines, and 3D CAD capabilities to support both growing demand and continued product development. A second expansion came in 2023 with a new office in Murrieta, California. The team behind every Nitron product draws from deep backgrounds in machining, materials technology, hydraulics, bike engineering, and F1 racing, with many engineers bringing firsthand experience as competitive drivers and riders. That depth of knowledge across both the technical and competitive sides of motorsport shapes every product Nitron develops.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Nitron NTR-R3 Coilover Kit for S550 Ford Mustang EcoBoost & GT [NTCFO019R3/NTCFO020R3]

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Nitron NTR-R3 Coilover Kit for S550 Ford Mustang EcoBoost & GT

Specialized Bi-Axis Hose Fittings

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for S550 EcoBoost / GT

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews