What is included in this BMW G8x differential upgrade pack?

The BMW G8x differential upgrade pack includes three components: the billet high-capacity baffled differential sump (MMR55-1600), the dual differential mount (MMR55-1606), and the rear differential output shaft heat shield set (MMR55-1607) — everything MMX makes for G8x rear differential reliability and thermal management.

Why buy the pack instead of individual components for this BMW G8x differential upgrade?

The three components were engineered to work together — the sump and mount integrate with no extra hardware — and the bundle is more cost-effective than buying each part separately. All three failure modes the OEM differential encounters on circuit (thermal saturation, drivetrain movement, heat soak) are addressed simultaneously.

Does this BMW G8x differential upgrade stop the track-day diff overheat warning?

Yes. The added capacity, baffling, and cooling fins on the sump are specifically designed to prevent the 'Rear Axle Differential Lock: Driving Stability Limited' warning that interrupts sessions when OEM diff temperatures exceed their limit.

Does this BMW G8x differential upgrade fit xDrive models?

Yes. Both RWD and xDrive G8x drivetrains are supported by this pack.

What else do I need for installation?

BMW RTV sealant for the sump (available as an option at order), a differential bushing for the mount (OEM or aftermarket, not included), and standard workshop tools. Professional installation is recommended.

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Description

MMX Ultimate Differential Track Pack for G8x BMW M2, M3, and M4

BMW G8x differential upgrade from MMX Performance bundles all three of MMX’s rear differential components into one coordinated track package for the G87 M2, G80/G81 M3, and G82/G83 M4: the high-capacity baffled sump (MMR55-1600), the dual differential mount (MMR55-1606), and the output shaft heat shield set (MMR55-1607). Each component addresses a distinct failure mode that the OEM differential system develops under sustained circuit use: the sump manages oil temperature and prevents the “Rear Axle Differential Lock: Driving Stability Limited” warning through added capacity, internal baffling, and cooling fins; the dual mount locks down drivetrain movement that the single OEM mount allows under hard acceleration and deceleration; and the heat shields control heat soak around the output shaft assembly that the stock setup leaves unmanaged. Together, this BMW G8x differential upgrade keeps the rear differential stable, cool, and consistent through hard braking, acceleration, and sustained high-G cornering, the three modes of failure the OEM system encounters first on a circuit-driven G8x. Direct-fit installation with no permanent modification required; compatible with both RWD and xDrive. The three components are also available individually, and BMW RTV sealant for the sump is available as an option at order.

Features

Complete differential reliability and thermal-management package for the G8x platform
Billet high-capacity baffled differential sump (MMR55-1600) up to 2 liters added capacity, baffled windage tray, -8AN cooler port
Dual differential mount (MMR55-1606) CNC-machined 6061-T6 billet secondary mount
Output shaft heat shield set (MMR55-1607) controls heat soak around the diff assembly
Prevents the OEM diff overheat warning that interrupts track sessions
Direct-fit; no permanent modification required; RWD and xDrive compatible
Sump and mount integrate with no extra hardware
1-year manufacturer warranty against defects in materials and workmanship

What’s Included

MMX billet high-capacity baffled differential sump (MMR55-1600)
MMX dual differential mount (MMR55-1606)
MMX rear differential output shaft heat shield set (MMR55-1607)

Applications

BMW M2: G87 | 2023-present
BMW M3: G80, G81 | 2021-present
BMW M4: G82, G83 | 2021-present

Notes

BMW RTV sealant is required to seal the sump. Select the sealant option at order if you do not already have it.
The dual differential mount requires a differential bushing to complete installation (OEM or aftermarket, not included)
Professional installation recommended. Components are also available individually. Contact us with fitment questions

Frequently Asked Questions

What is included in this BMW G8x differential upgrade pack? The BMW G8x differential upgrade pack includes three components: the billet high-capacity baffled differential sump (MMR55-1600), the dual differential mount (MMR55-1606), and the rear differential output shaft heat shield set (MMR55-1607) everything MMX makes for G8x rear differential reliability and thermal management.
Why buy the pack instead of individual components for this BMW G8x differential upgrade? The three components were engineered to work together the sump and mount integrate with no extra hardware and the bundle is more cost-effective than buying each part separately. All three failure modes the OEM differential encounters on circuit (thermal saturation, drivetrain movement, heat soak) are addressed simultaneously.
Does this BMW G8x differential upgrade stop the track-day diff overheat warning? Yes. The added capacity, baffling, and cooling fins on the sump are specifically designed to prevent the “Rear Axle Differential Lock: Driving Stability Limited” warning that interrupts sessions when OEM diff temperatures exceed their limit.
Does this BMW G8x differential upgrade fit xDrive models? Yes. Both RWD and xDrive G8x drivetrains are supported by this pack.
What else do I need for installation? BMW RTV sealant for the sump (available as an option at order), a differential bushing for the mount (OEM or aftermarket, not included), and standard workshop tools. Professional installation is recommended.

About MMX Performance

MMX Performance is a UK-based specialist in performance parts for BMW and MINI vehicles, crafting high-quality upgrades that blend precision engineering, rigorous testing, and motorsport heritage. Driven by enthusiast culture, MMX designs its products in the UK, often putting them through track validation, to ensure durability, fitment accuracy, and on-road performance. Their catalog spans drivetrain components, spacers, hardware, and chassis enhancements, all tailored to elevate both the driving experience and visual appeal of BMW and MINI models.

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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MMX Ultimate Differential Track Pack for G8X BMW M2 / M3 / M4 [MMR55-1600KT-RTV/MMR55-1600KT]

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MMX Ultimate Differential Track Pack for G8x BMW M2, M3, and M4

Features

What’s Included

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Notes

Frequently Asked Questions

About MMX Performance

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