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E8X/E9X Open Differential Weld Plates

Convert your open differential to a locked differential without the costly expense of an limited-slip conversion.
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

ECS
Mfg Part #
056350LA01
ECS Part #
ES#4841518
Brand
ECS

SALE: 23.24 (25% OFF)
WAS: $30.99 on 06-13-2026

This product was last offered at the strikethrough price on
06-13-2026


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on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
This product is backed by our
Lifetime Replacement Program! Read more here
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Product Details

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Prepare your car for the drift track without replacing your differential! These durable, laser-cut steel plates are designed to be welded to the spider gears inside your differential, effectively sending power to both wheels for a more predictable slide. 

Your vehicle's differential is designed to allow the inside and outside rear wheels to turn at different speeds. While this design is ideal for daily driver comfort, it severely inhibits your drifting capability on the track. Adding our weld-in plates to your open differential effectively locks the two rear axles, ensuring that they spin at the same speed around turns. Sending power to both rear wheels offers the added benefit of improved control in low-traction areas and easier drift initiation. 

Featured in the "Built by Mike" E90 Drift Car Build Series!

Features & Benefits:

  • Laser-cut design for a precise fitment in your factory differential
  • Fabricated to fit inside the spider gears for an easier weld and increased confidence
  • Manufactured from 7GA (3/16") mild steel

Design:

  • Our E8X/E9X Open Differential Weld Plates were designed, engineered, tested, and quality inspected by our Research and Development team in our Wadsworth, OH facility. We strive for the highest level of precision and quality through leading-edge product development technology including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.
Cross Reference
  • 33127520872, 33-12-7-520-872, 33 12 7 520 872
  • 33117518404, 33-11-7-518-404, 33 11 7 518 404
  • 33107566179, 33-10-7-566-179, 33 10 7 566 179

This Part Fits the Following Vehicles

Make Model Submodel Engine Special Fitment Notes
BMW E82 128i N52 3.0L Use vehicle selector to confirm fitment
BMW E88 128i N52 3.0L Use vehicle selector to confirm fitment
BMW E90 325i N52 3.0L Use vehicle selector to confirm fitment
BMW E90 328i N52 3.0L Use vehicle selector to confirm fitment
BMW E90 330i N52 3.0L Use vehicle selector to confirm fitment
BMW E90 335i N54 3.0L Use vehicle selector to confirm fitment
BMW E90 335i N55 3.0L For vehicles with automatic transmissions only - medium case differentials
BMW E91 328i N52 3.0L Use vehicle selector to confirm fitment
BMW E92 328i N52 3.0L Use vehicle selector to confirm fitment
BMW E92 335i N54 3.0L For automatic transmission vehicles only, or manual transmission vehicles produced before 09/2007.
BMW E92 335i N55 3.0L For vehicles with automatic transmissions only - medium case differentials
BMW E93 328i N52 3.0L Use vehicle selector to confirm fitment
BMW E93 335i N54 3.0L For automatic transmission vehicles only, or manual transmission vehicles produced before 09/2007.
BMW E93 335i N55 3.0L For vehicles with automatic transmissions only - medium case differentials
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.

This Product Is Covered By Our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

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Return and Exchanges

Need to set up a return? Click here to begin: Return Process

All you need is your order number and email address.


New/Unused Product Returns

ECS Tuning will accept returns for unused products within 90 days of the ship date for a refund to the original payment method used. The customer is responsible for the return shipping costs and fees. If selecting to use a prepaid shipping label, the shipping cost will be deducted from the total refunded amount. All new/unused products must be new, unused and must be in the original packaging, including labeling, manuals, hardware, etc. Special order parts are non-refundable.

In the event that we find an error on our website or on behalf of an ECS Tuning Representative, we will provide a return shipping label from the original delivery location.

Refused Packages

Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.

Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.

Return Process

Return Process

ECS Tuning now offers an online returns solution! To get started, simply log into your ECS Tuning account, Click the "View Orders" button on the My Account home page and select the order that you wish to make a return on to begin. If you have any questions, feel free to reach out to our Customer Service Team for assistance!

Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.

Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.


All in store credit balances will expire after one year from the original purchase date.

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Shipping Policy

Free Shipping On Orders $49 & Up

Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.

Free Shipping

Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.


The policies listed above are subject to change at any time without notice.

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Lifetime Replacement

Want to know more about our Lifetime Replacement program?

Click here to learn more.

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Why You Should Shop From ECS Tuning

ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.


Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.

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Cancellation Policy

At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.

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Manufacturer names and/or part numbers are used only for identification purposes.

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