BTKUSA Dual Differential Mount G80M3/G82M4/G87M2 S58

BuiltToKillUSA

BTKUSA Dual Differential Mount G80M3/G82M4/G87M2 S58

$549.99 USD

In Stock - Ready To Ship

Bushing Option: No Bushing

No Bushing
80A Bushing (needed for installation)

Pick Style: Type 3 Hard Anodized

Type 3 Hard Anodized
Raw Billet

Product variants

Pairs well with

Description

MADE IN SAN CLEMENTE, CA🇺🇸

ALL HARDWARE FOR ASSEMBLY INCLUDED

(IF HAVING TROUBLE PURCHASING ON RVNG PLEASE GO TO BUILTTOKILLUSA.COM AND PURCHASE THERE)

The BuiltToKillUSA Differential Dual Mount is designed to reinforce one of the G8X platform’s known weak points. By utilizing the unused factory secondary bushing location, it adds a second support to keep the differential stable under hard acceleration, aggressive launches, and spirited driving. This reduces flex and sharpens overall driveline response.

installation is super simple. No disassembly of oem components needed. Insert the bushing assemble the mount on diff and BOOM…Unparalleled driveline support

WHAT IS A DUAL DIFF MOUNT AND HOW CAN IT BENEFIT MY BUILD?

1. Improved load distribution

The mount ties both sides of the differential into the subframe instead of relying on a single ear or bushing.
This spreads torque load more evenly under hard acceleration, launches, and aggressive shifts.
That’s especially important on higher-torque cars where the diff wants to rotate upward.

2. Reduced differential movement

The billet bridge + side arms strongly limit diff wind-up and rotation.
Less movement = more consistent driveline geometry.
This directly helps with:

Reduced wheel hop
More predictable traction
Less shock loading on axles and bushings

3. Structural rigidity

All US 6061 machined aluminum
Weighs only 20 oz for whole assembly

Our Type III hard anodized, also called hard coat anodizing, is a surface treatment applied electrically that greatly enhances the aluminum’s properties. Key benefits include:

• Extreme hardness & wear resistance — significantly harder than typical anodizing and often compared to hardened steels in surface properties.

• Thick protective oxide layer that resists scratching, abrasion and corrosion.

• Better surface durability under stress — ideal for high-use parts.

• Good chemical resistance and improved ability to retain lubricants.

This coating is compliant with MIL-A-8625 Type III standards, which is considered a mil-spec (military grade) finish for aluminum parts that see heavy use.

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BTKUSA Dual Differential Mount G80M3/G82M4/G87M2 S58

No Bushing / Type 3 Hard Anodized

$549.99 USD

Fitment Guaranteed

Ships in 1-3 Days

Lifetime Warranty

30-Day Returns

Track Tested

Lifetime Warranty

FAQs

Answers to our most common questions below.

How Long Does Shipping Take?

All Rvng items ship within 1-3 days, if an item is out of stock the customer will be notified with the choice of a refund or an estimated timeline of delivery.

Do You Have Exhaust Parts For My Car?

We make a range of downpipes and exhaust systems for almost all BMW's. We choose to specialize in that market so we can always insure we are selling the best product possible for your Beamer!

Do You Offer In Person Pick-Up & Installs In Cali?

Yes, We are located in Garden Grove in Orange County, California. We invite any of our customers to pick-up in stock items and for any install or car related work.

Will Installing These Parts Void My Factory Warranty?

Aftermarket performance parts can affect your factory warranty on related components under the Magnuson-Moss Warranty Act — a dealer must prove the part caused the failure to deny a claim. We recommend speaking with your dealer or tuner. Our parts are precision-engineered to factory tolerances and we stand behind every product with our own Lifetime Warranty against defects and fitment issues.

Do These Parts Require a Tune?

Some parts — particularly downpipes, intake kits, and fuel system upgrades — will require or strongly benefit from an ECU tune to see full performance gains and to prevent check engine lights. Parts like heat exchangers, oil coolers, and hardware do not require a tune. We recommend reaching out to us or your local tuner before purchasing if you're unsure.

What Is Your Return Policy?

We accept returns within 30 days of delivery on unused, uninstalled, and undamaged items in original packaging. Custom or made-to-order parts are non-returnable. To start a return, contact us at rvngperformance@yahoo.com with your order number. Return shipping is the customer's responsibility unless the item arrived damaged or incorrect.

Are Your Catless Downpipes Street Legal?

Catless downpipes are intended for off-road and track use only. They are not emissions compliant and will trigger a check engine light without an appropriate tune or O2 spacers. If you need a street-legal option, contact us — we can discuss catted alternatives depending on your platform.

How Do I Know This Will Fit My Car?

Every RVNG product is developed and validated on the specific platforms listed. If your exact build year, model, or configuration isn't listed, contact us before ordering — we'll confirm fitment. We stand behind every part with our Fitment Guarantee: if it doesn't fit as described, we'll make it right.