Does this kit require the Nitron Electronic Damping Delete Kit?

Yes. BMW Adaptive M Suspension comes standard on the M3 Competition xDrive and M4 Competition xDrive. The NTR-R1 is a non-electronic kit, so the Nitron Electronic Damping Delete Kit is required alongside it to prevent fault codes and warning lights.

Why do the xDrive variants get a separate kit from the RWD M3 and M4?

The xDrive all-wheel drive system changes how the chassis loads and distributes weight compared to the RWD variants. That difference influences what the suspension needs to do, so Nitron develops the spring rates and damping characteristics around the xDrive platform specifically rather than adapting the RWD kit to fit. The front spring rate in the Track Day Spec is also noticeably stiffer on the xDrive kit, which reflects how the AWD system affects front axle loading under hard driving.

At what point does the divorced rear configuration make more sense than the coilover setup?

When the build is moving toward dedicated circuit use and geometry optimization becomes a priority over installation simplicity. The divorced setup allows the spring and damper to be positioned and adjusted independently, which opens up setup options that a coilover configuration physically can't offer. For road use or occasional track days, the coilover setup covers everything needed without the added complexity.

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Description

Nitron NTR-R1 Coilover Kit for G8x BMW M3 Competition xDrive / M4 Competition xDrive

The G80 M3 Competition xDrive and G82 M4 Competition xDrive are capable platforms that the factory suspension doesn’t fully serve when the driving gets serious. BMW’s all-wheel drive system already handles a significant portion of the dynamic workload, but the damping hardware was calibrated for a broad audience rather than a driver who wants to work with the chassis rather than around it. The Nitron NTR-R1 addresses that with precision-engineered, combined 2-way damping adjustment drawn directly from the R3 race platform, sharing core components with a kit built for professional competition. Coilover and divorced rear suspension configurations are both available to suit different build requirements, and the kit includes droplinks so the installation is complete without sourcing additional hardware. Every unit is individually hand-built with ultra-low friction components that deliver consistent, fade-resistant damping from the street to the circuit, and with each kit custom built, custom sprung, and fully serviceable, it’s an investment that holds up well beyond a single season.

Coilover vs Divorced Rear Suspension

The M3 Competition xDrive and M4 Competition xDrive NTR-R1 is available with two rear suspension configurations depending on how the car is being built. The coilover setup 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 R1 suits the build rather than forcing a compromise.

Unique Technology

Nitron builds every shock from components that go through a rigorous design and development process long before they reach final assembly. The modular construction gives engineers the room to develop each application on its own terms without cutting corners on part quality or how everything holds together under real load. Tight tolerances, individual inspection by trained technicians, and quality control that runs through the entire production process rather than just the end of it; that discipline, combined with proprietary Nitron technologies built in throughout, produces shocks that hold their own against the competition on both road and track.
- 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

The xDrive variants of the M3 Competition and M4 Competition carry different weight distribution and chassis dynamics than their RWD counterparts, and Nitron accounts for that from the ground up rather than adapting an existing application to fit. Components, spring rates, and damping characteristics are developed around what these specific cars actually need. The geometry, suspension travel, and the way xDrive loads the chassis all shape the design from day one rather than being addressed after the fact.

Features

Coilover or divorced rear suspension types
Internal reservoir type
2-way combined adjustment
Full alloy body
Preload adjuster
Combined 24 clicks of adjustment
Nitrogen gas charged
Precision bearing spacers supplied as required
Consists of 4 coilover assemblies, top mounts, and droplinks
Hand made to order

Specifications

Coilover Type: NTR-R1
Adjustment Type: 2-way combined
Adjustment: 24 clicks combined
Rear Suspension Types:
- Coilover
- Divorced
Droplinks Included: Yes
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 685lbs/inch (120N/mm)
  - Rear:
    - Coilover: 400lbs/inch (70N/mm)
    - Divorced: 799lbs/inch (140N/mm)
- TDS – Track Day Spec:
  - Front: 913lbs/inch (160N/mm)
  - Rear:
    - Coilover: 514lbs/inch (90N/mm)
    - Divorced: 913lbs/inch (160N/mm)

Applications

BMW M3 Competition xDrive: G80 | 2021-present
BMW M4 Competition xDrive: G82 | 2021-present

Other Suspension Kits for G8x M3 and M4 Competition xDrive

Notes

Does not fit RWD models
Fitting a non-electronic coilover kit without addressing the Adaptive M Suspension system will typically trigger fault codes and warning lights, so the Nitron Electronic Damping Delete Kit is required alongside this kit to avoid those faults.
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.
Precision bearing spacers supplied as required

Frequently Asked Questions

Does this kit require the Nitron Electronic Damping Delete Kit? Yes. BMW Adaptive M Suspension comes standard on the M3 Competition xDrive and M4 Competition xDrive. The NTR-R1 is a non-electronic kit, so the Nitron Electronic Damping Delete Kit is required alongside it to prevent fault codes and warning lights.
Why do the xDrive variants get a separate kit from the RWD M3 and M4? The xDrive all-wheel drive system changes how the chassis loads and distributes weight compared to the RWD variants. That difference influences what the suspension needs to do, so Nitron develops the spring rates and damping characteristics around the xDrive platform specifically rather than adapting the RWD kit to fit. The front spring rate in the Track Day Spec is also noticeably stiffer on the xDrive kit, which reflects how the AWD system affects front axle loading under hard driving.
At what point does the divorced rear configuration make more sense than the coilover setup? When the build is moving toward dedicated circuit use and geometry optimization becomes a priority over installation simplicity. The divorced setup allows the spring and damper to be positioned and adjusted independently, which opens up setup options that a coilover configuration physically can’t offer. For road use or occasional track days, the coilover setup covers everything needed without the added complexity.

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-R1 Coilover Kit for G8x BMW M3 Competition xDrive / M4 Competition xDrive [NTCBM032R1]

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Nitron NTR-R1 Coilover Kit for G8x BMW M3 Competition xDrive / M4 Competition xDrive

Coilover vs Divorced Rear Suspension

Unique Technology

Bespoke Engineering

Features

Specifications

Applications

Other Suspension Kits for G8x M3 and M4 Competition xDrive

Notes

Frequently Asked Questions

About Nitron Suspension

Reviews