BTKUSA F8X/S55 DUAL DIFF MOUNT
Pairs well with
Description
BTK USA F8X Dual Differential Mount
The factory F8X differential is designed with provisions for two rear mounting points, yet BMW chose to utilize only a single rear differential bushing. Under hard acceleration, aggressive launches, and high horsepower applications, this allows the differential to twist within the subframe, increasing driveline movement, wheel hop, and unnecessary stress on the factory mounting components.
The BTK Dual Differential Mount was engineered to unlock the second factory mounting location, transforming the rear differential into a true dual-supported design. By distributing drivetrain loads across two rear mounting points instead of one, differential deflection is significantly reduced, resulting in a more planted rear end, improved power transfer, and increased confidence under heavy acceleration.
Machined in the USA from aerospace-grade 6061-T6 billet aluminum, every mount is CNC machined for exceptional precision before receiving a durable Type III hard anodized finish for maximum wear and corrosion resistance. Every detail was designed to withstand the abuse of high-power street cars, drag builds, and dedicated track vehicles alike.
Whether your F8X is making stock power or well into four-digit horsepower territory, the BTK Dual Differential Mount provides the rigidity and strength needed to keep the drivetrain under control without compromising fitment.
Features
- CNC machined from billet 6061-T6 aluminum
- Type III hard anodized finish
- Utilizes the factory secondary differential mounting location
- Reduces differential movement under load
- Improves drivetrain stability and power transfer
- Helps minimize wheel hop during aggressive launches
- Engineered and manufactured in the USA
- Direct bolt-on installation
- Fits BMW F80 M3, F82/F83 M4, and F87 M2 Competition
BTKUSA F8X/S55 DUAL DIFF MOUNT
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 BMWs. We choose to specialize in that market so we can always ensure we are selling the best product possible for your Bimmer!
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 contact@rvngraceworks.com with your order number. Return shipping is the customer's responsibility unless the item arrived damaged or incorrect.
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.
If you have any questions, we're always welcome to help. We'll get back to you within 24 hours on weekdays.
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Shipping Information
All orders ship within 1-3 business days from our Garden Grove, CA facility.
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Customer Support
We're here to help. Reach out anytime and we'll get back to you within 24 hours on weekdays.
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FAQ's
Check out our FAQ section below for answers to our most common questions.
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Contact Us
Located in Garden Grove, CA. Stop by for pickup or install appointments — we'd love to meet you.