Does the MMX Dual Differential Mount for F8X come with differential bushings?

No. The part is the 6061-T6 billet mount by itself. It installs on the factory rear differential bushings, or on the stiffer MMX polyurethane bushings, which are sold separately and need two per car. Buying the mount on its own lets an owner keep the factory isolation level or firm it up later without replacing the mount.

Which BMW models does this differential mount fit?

It fits the F8X family: the F87 M2 and M2 Competition and CS, the F80 M3, and the F82 and F83 M4. These cars share the same rear differential and subframe mounting, so the billet mount bolts to all of them in the factory location. It does not fit the G8X M2, M3 or M4, which use the separate MMX G8X mount.

What is the MMX Dual Differential Mount for F8X made from?

It is machined from 6061-T6 billet aluminum, a heat-treatable alloy chosen for stiffness and strength at low weight. Cutting the mount from solid billet rather than casting it keeps the second mounting point rigid under drivetrain load, which is the whole point of the part. MMX produces it in the UK on its own CNC equipment.

What does adding a second differential mount point actually do?

The factory holds the F8X rear differential on one mounting point, so under power the unit twists and walks, which adds driveline slop and heat and can crack the factory mounts over time. Bracing the housing at a second point cuts that movement, sharpens throttle response at the rear wheels, and lowers the heat the mounts take on a hard-driven car.

Is the mount a direct fit or does it need modification?

It is a direct bolt-in. The mount uses the factory differential location and needs no cutting, welding or subframe modification. Most owners expect a small rise in drivetrain noise and vibration afterward, which is normal when a rubber-isolated mount is backed up by a rigid billet one. A workshop familiar with F8X rear end service can fit it on a lift.

What is the +10mm raised option for?

Lowering an F8X car changes the angle of the driveshaft into the differential. Run with the MMX Front Differential Lift Mount and Cradle in its raised setting, this mount lifts the differential by 10mm to bring that angle back toward factory, which eases load on the driveshaft and bearings. At stock ride height the mount is used in the standard position.

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Description

MMX Performance Dual Differential Mount for F8X BMW M2 / M3 / M4

MMX Performance’s Dual Differential Mount for F8X BMW M2 / M3 / M4 answers a weakness BMW engineered into the S55 and N55 cars: a rear differential carried on a single factory mounting point that lets the unit walk under hard drive and lift. Machined in-house from 6061-T6 billet aluminum by a UK marque founded by racing driver Max Marshall, it braces the diff at a second point the factory casting leaves unused and ties the housing more firmly to the subframe. The payoff is a drivetrain that stays where it was put when a tuned M car loads the rear axle, with only a small rise in noise to show for it. For an owner chasing traction and mechanical precision rather than a badge, it is the quiet, correct fix for a known failure point.

Features

Machined from 6061-T6 billet aluminum for stiffness without added mass
Adds a second rear differential mounting point the factory casting leaves unused
Spreads differential load across two points to cut deflection under power
Supports factory differential height, or a +10mm raised setup when paired with the MMX Front Differential Lift Mount and Cradle, correcting driveshaft angle on lowered cars
Reduces heat buildup at the differential mounts on hard-driven and lowered builds
Runs on factory differential bushings or firmer MMX polyurethane bushings
Direct fit with no subframe modification and only a small increase in NVH
Targets the F8X rear differential mount cracking owners report on tuned cars

Applications

BMW M2: F87 | 2016-2018 | 3.0L N55
BMW M2 Competition / CS: F87 | 2019-2021 | 3.0L S55
BMW M3: F80 | 2015-2018 | 3.0L S55
BMW M4: F82 / F83 | 2015-2020 | 3.0L S55

Notes

This is the billet mount only; the differential bushings are sold separately, and it runs on the factory bushings or the firmer MMX Rear Differential Polyurethane Bushings, two required
For a +10mm raised differential on a lowered car, the mount pairs with the MMX Front Differential Lift Mount and Cradle
Owners who run the car hard on track pair it with the MMX F8X High Capacity Baffled Differential Sump
The Dual Differential Mount for F8X installs in the factory location with no cutting, welding or subframe modification
Expect a small increase in drivetrain noise and vibration, which is normal when a rigid billet mount backs up a rubber-isolated one

Frequently Asked Questions

Does the MMX Dual Differential Mount for F8X come with differential bushings? No. The part is the 6061-T6 billet mount by itself. It installs on the factory rear differential bushings, or on the stiffer MMX polyurethane bushings, which are sold separately and need two per car. Buying the mount on its own lets an owner keep the factory isolation level or firm it up later without replacing the mount.
Which BMW models does this differential mount fit? It fits the F8X family: the F87 M2 and M2 Competition and CS, the F80 M3, and the F82 and F83 M4. These cars share the same rear differential and subframe mounting, so the billet mount bolts to all of them in the factory location. It does not fit the G8X M2, M3 or M4, which use the separate MMX G8X mount.
What is the MMX Dual Differential Mount for F8X made from? It is machined from 6061-T6 billet aluminum, a heat-treatable alloy chosen for stiffness and strength at low weight. Cutting the mount from solid billet rather than casting it keeps the second mounting point rigid under drivetrain load, which is the whole point of the part. MMX produces it in the UK on its own CNC equipment.
What does adding a second differential mount point actually do? The factory holds the F8X rear differential on one mounting point, so under power the unit twists and walks, which adds driveline slop and heat and can crack the factory mounts over time. Bracing the housing at a second point cuts that movement, sharpens throttle response at the rear wheels, and lowers the heat the mounts take on a hard-driven car.
Is the mount a direct fit or does it need modification? It is a direct bolt-in. The mount uses the factory differential location and needs no cutting, welding or subframe modification. Most owners expect a small rise in drivetrain noise and vibration afterward, which is normal when a rubber-isolated mount is backed up by a rigid billet one. A workshop familiar with F8X rear end service can fit it on a lift.
What is the +10mm raised option for? Lowering an F8X car changes the angle of the driveshaft into the differential. Run with the MMX Front Differential Lift Mount and Cradle in its raised setting, this mount lifts the differential by 10mm to bring that angle back toward factory, which eases load on the driveshaft and bearings. At stock ride height the mount is used in the standard position.

About MMX Performance

MMX Performance builds billet drivetrain and engine hardware for BMW and MINI, engineered and machined in the United Kingdom. The brand was founded in 2010 as MMR by professional racing driver Max Marshall, drawing on two decades of RacingLine development experience, and it designs every part with CAD modeling and 3D scanning before validating prototypes on its own dyno, road and track development cars. Its catalogue runs from wheel spacers and short shifters to single-piece crank hubs, lowering springs, baffled sumps and the differential hardware this mount belongs to. The focus is narrow and deliberate: parts that address the weak points a hard-driven M car exposes, made to a standard an owner of a fine car expects.

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 Performance Dual Differential Mount for F8X BMW M2 / M3 / M4 [MMR55-1001]

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MMX Performance Dual Differential Mount for F8X BMW M2 / M3 / M4

Features

Applications

Notes

Frequently Asked Questions

About MMX Performance

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