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-R3 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 different spring rates than the RWD M3 and M4?

The xDrive AWD system adds meaningful weight to the front of the car and changes how the chassis loads under braking and cornering compared to the RWD variants. Both the Fast Road Spec and Track Day Spec front rates on the xDrive kit are stiffer than their RWD equivalents, reflecting the increased front axle loading that comes with the AWD drivetrain.

What is the difference between the piggyback and hose reservoir configurations?

Piggyback reservoirs mount directly to the shock body, keeping the package compact and straightforward for installation. Hose reservoirs use a flexible line to position the reservoir remotely, which can be useful where packaging space is tight or where easier access to the compression adjusters is a priority. Both offer the same 3-way independent adjustment capability; the choice comes down to fitment preference and how the car is being built. Front hose reservoirs come standard with quick release dry break connections at an additional cost.

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BP PRICING DIFFERENCE

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Description

Nitron NTR-R3 Coilover Kit for G8x BMW M3 Competition xDrive / M4 Competition xDrive

When the driving gets serious on an xDrive platform, the factory suspension hardware becomes the limiting factor well before the chassis does. The Nitron NTR-R3 coilover kit for the G80 M3 Competition xDrive and G82 M4 Competition xDrive is built for drivers and engineers who want to work with that reality rather than around it. Independent 3-way damping adjustment with separate high and low speed compression control gives the range needed to properly dial the car in across different circuits and conditions, with the xDrive weight distribution and chassis loading factored into the spring rates from the start. 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. 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. Piggyback or hose reservoir configurations are available for both front and rear, keeping high and low speed compression adjustment accessible at both ends. 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.

Coilover vs Divorced Rear Suspension

The M3 Competition xDrive and M4 Competition xDrive NTR-R3 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 R3 suits the build rather than forcing a compromise.

Specialized Bi-Axis Hose Fittings

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

Unique Technology

Nitron builds every shock from precision components that go through a thorough design and development process well before final assembly. The modular construction gives engineers the flexibility to approach each application on its own terms without cutting corners on part quality or how components perform together under load. Everything is machined to tight tolerances and inspected individually by trained technicians, with quality control running through every stage of production rather than being concentrated at the end. New materials, finishes, and processes are validated extensively before adoption, with proprietary Nitron technologies integrated throughout to produce shocks that consistently hold up against the competition on road and track. That engineering standard is what 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

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. The geometry, suspension travel, and the way xDrive loads the chassis under hard driving all shape the component choices, spring rates, and damping characteristics from day one. That’s what separates a kit developed for these specific cars from one that was built for the platform category and happens to cover the AWD variants by extension.

Features

Coilover or divorced rear suspension types
Front and rear piggyback or hose reservoir options
Quick release dry breaks for front hose reservoirs
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

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
  - Hose (+ dry break option)
- Rear:
  - Piggyback
  - Hose
Rear Suspension Types:
- Coilover
- Divorced
Droplinks Included: Yes
Recommended Spring Rates:
- FRS – Fast Road Spec:
  - Front: 799lbs/inch (140N/mm)
  - Rear:
    - Coilover: 400lbs/inch (70N/mm)
    - Divorced: 742lbs/inch (130N/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.

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-R3 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 different spring rates than the RWD M3 and M4? The xDrive AWD system adds meaningful weight to the front of the car and changes how the chassis loads under braking and cornering compared to the RWD variants. Both the Fast Road Spec and Track Day Spec front rates on the xDrive kit are stiffer than their RWD equivalents, reflecting the increased front axle loading that comes with the AWD drivetrain.
What is the difference between the piggyback and hose reservoir configurations? Piggyback reservoirs mount directly to the shock body, keeping the package compact and straightforward for installation. Hose reservoirs use a flexible line to position the reservoir remotely, which can be useful where packaging space is tight or where easier access to the compression adjusters is a priority. Both offer the same 3-way independent adjustment capability; the choice comes down to fitment preference and how the car is being built. Front hose reservoirs come standard with quick release dry break connections at an additional cost.

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 G8x BMW M3 Competition xDrive / M4 Competition xDrive [NTCBM032R3]

Guaranteed Safe Checkout

Nitron NTR-R3 Coilover Kit for G8x BMW M3 Competition xDrive / M4 Competition xDrive

Coilover vs Divorced Rear Suspension

Specialized Bi-Axis Hose Fittings

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