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K2 Industries & OUR OWN FAQ's
BMW E81 / E82 / E87 / E88 1 Series & E90 / E91 / E92 / E93 3 Series Billet Aluminium Rear Differential Mount Insert Kit 2005 - 2013 (Excludes 1M / M3)
SKU: 1005010633936864
Sale price
$209.99 USD
Regular price
$229.00 USD
Shipping calculated at checkout.
Eliminate rear differential movement and tighten up power delivery on your BMW E8X / E9X chassis with this premium billet aluminium rear differential mount insert kit, precision CNC-machined from 6061 billet aluminium for permanent durability and dramatically improved drivetrain response. Factory rubber differential bushings on the E8X / E9X chassis are notorious for deforming under load — particularly when applying or releasing throttle in spirited driving — resulting in vague feedback from the rear axle, clunky shifts, and unstable handling characteristics that frustrate enthusiasts. Commercially available polyurethane and solid differential bushings address the deformation issue but introduce significant NVH penalties and complicated installation procedures. This insert kit takes a smarter approach — precision-fit aluminium inserts fill the voids in the factory differential bracket, suppressing differential displacement and optimizing drivetrain response without the harsh NVH increase of full bushing replacement. The result is sharper throttle response, smoother shifts, and more consistent rear-end behavior with minimal impact on daily driveability.
Features:
- Sturdy and durable construction – 6061 billet aluminium material delivers exceptional strength while keeping weight low
- CNC machined precision – ensures high dimensional accuracy for a perfect fit to factory differential mounting bracket geometry
- Anodized surface finish – delivers rust-proof and anti-corrosion protection for sustained underbody and weather exposure
- Precision reinforcement design – factory-positioned inserts fill the voids in the differential bracket perfectly, suppressing rubber compliance without replacing the entire bushing
- Dynamic performance enhancement – suppresses differential displacement under load, optimizes shift smoothness, and maintains linear throttle response
- Low NVH improvement design – delivers performance benefits with minimal noise, vibration, and harshness increase compared to full polyurethane or solid bushing alternatives
- Simpler installation than full bushing replacement – avoids the complicated extraction and pressing procedures required for complete differential bushing replacement
Specifications:
- Condition: 100% Brand New
- Type: Rear Differential Mount Insert Kit
- Material: 6061 Billet Aluminium
- Construction: CNC Machined
- Surface Finish: Anodized
- NVH Increase: Low
- Position: Rear Differential Mount Bracket
- Purpose: Performance Upgrade / Drivetrain Stabilization
Fitment:
Will NOT fit BMW 1M or M3 variants. Verify your model and trim before ordering.
- BMW 1 Series E81 / E82 / E87 / E88 (2005 – 2013) – Excludes 1M
- BMW 3 Series E90 / E91 / E92 / E93 (2005 – 2013) – Excludes M3
- Compatible with non-M variants only – not compatible with BMW 1M or M3 chassis which use different rear differential mounting geometry
- Confirm vehicle model, chassis code, and trim before ordering
Contents:
- Rear Differential Mount Insert Kit
Benefits:
- Eliminates the vague rear axle feedback caused by deformed factory rubber differential bushings – delivering sharper, more direct rear-end response under throttle
- Suppresses differential displacement under load – the rear differential stays positioned correctly during hard acceleration, deceleration, and gear changes
- Optimizes shift smoothness on both manual and automatic transmissions – reduced differential movement during shifts eliminates the clunky engagement common to aged factory bushings
- Maintains linear throttle response – particularly noticeable during transition phases (on/off throttle) where rubber bushing deformation typically introduces lag and inconsistency
- Smarter approach than full bushing replacement – the precision insert design delivers most of the performance benefits of solid bushings without the harsh NVH increase or complicated installation
- 6061 billet aluminium construction provides permanent dimensional stability – will not crack, deform, or degrade like rubber alternatives over time
- Anodized finish maintains the premium aluminium appearance and corrosion resistance for the lifetime of the vehicle
- Significant cost savings compared to high-end polyurethane or solid differential bushing kits while delivering equivalent performance benefits with better daily driveability
Installation Notes:
- Body / chassis fitment verification: This kit fits non-M E8X / E9X variants only. It will NOT fit 1M, M3, or other M-specific chassis which use different rear differential mounting geometry
- Properly support the rear of the vehicle on jack stands rated for the vehicle weight before beginning installation – never work under a vehicle supported only by a jack
- Inserts are designed to fill voids in the existing factory differential bracket – they complement rather than replace the factory rubber bushings
- Inspect the surrounding rear differential mounting hardware during installation – worn or damaged factory bushings should be replaced before installing the inserts for optimal performance
- Ensure inserts are properly seated in their factory-designed positions before final assembly – improper seating will compromise the precision reinforcement benefit
- Apply manufacturer-specified torque values to all rear differential mounting hardware after installation
- Test rear-end response and drivetrain behavior at low speeds before aggressive driving – the difference is typically immediately noticeable in throttle response and rear-end stability
- Professional installation recommended if you are unfamiliar with rear differential and subframe service procedures
- If unsure about compatibility with your specific BMW variant or chassis code, contact our team with your year, model, and chassis code (E81 / E82 / E87 / E88 / E90 / E91 / E92 / E93) before ordering
Warranty:
- 12-month standard warranty from date of purchase
- Contact our support team for assistance with any issues
K2 Industries & OUR OWN FAQ's
How do I check fitment?
Check the listing for your year, make, model, trim and engine. Body style, build date and factory options can matter. If the listing is unclear, send FI Performance your vehicle details and the product link or SKU before ordering.
What comes with this part?
Check the product description for quantities, hardware and accessories. Photos may show the part installed with other components. Ask us if you need to confirm whether a part is sold individually, as a pair or as a kit.
Will I need extra parts or modifications?
That depends on the part and your setup. Check for adapters, wiring, coding, tuning, trimming or additional hardware before booking installation. If you already have aftermarket parts, tell us what’s installed.
What should I check for headlights or tail lights?
Match your factory lighting type, connector and body style. Halogen, HID and LED assemblies can differ even on the same model. Check pre-facelift versus facelift fitment and features such as adaptive lights or leveling.
Should I have a shop install it?
We recommend a qualified installer for wiring, engine, brake and suspension work. Inspect the part and confirm fitment before cutting, drilling, painting or modifying anything.
When will my order ship?
Availability and lead time vary by item. If you’re working around a shop appointment or event, contact FI Performance for a current estimate before ordering.
How do returns and warranty claims work?
Contact FI Performance with your order number before sending anything back. Eligibility depends on the item, its condition and the applicable policy. If there’s damage or a defect, keep the packaging and send photos of the part, label and issue.
Is this part intended for street use?
Check the listing for any use restrictions and confirm the requirements where you drive. If you need a specific approval or certification, ask us to verify it for the exact part number before ordering.
Why should I buy from FI Performance?
FI Performance is a USA-based team of automotive enthusiasts focused on quality, reliability and helpful support. We work closely with manufacturers and can help guide your build from product selection through order support.
How can I contact customer support?
Reach FI Performance by live chat, email or phone for product questions, order help and automotive guidance.
What parts are best for my car and goals?
Tell FI Performance your vehicle, intended use and goals. We can help narrow down the right parts and put together a practical modification plan for your build.
Do you offer financing options?
Eligible financing options are shown at checkout. Select the available financing method during checkout to review payment terms and monthly-payment options.
How do I track my order?
When your order ships, FI Performance sends tracking information by email so you can follow delivery progress and view the estimated arrival date.
What payment methods do you accept?
FI Performance accepts major credit cards, PayPal and any financing options displayed at checkout.
How do I know if I have factory Xenon lighting?
Factory Xenon lights commonly have a blue-tinted output and a short warm-up period. Check your owner's manual or send FI Performance your vehicle details so we can help confirm your factory lighting type.
What is the difference between Halogen, HID and LED lighting?
Halogen lighting is the traditional, affordable option. HID lighting typically provides greater brightness, while LED lighting is energy-efficient and long-lasting. FI Performance can help you select the correct option for your vehicle.
How do I prevent lighting condensation?
Condensation can occur as temperatures change. Lighting assemblies are designed to minimize it; contact FI Performance for guidance if you see persistent condensation or have product-specific questions.
How do I check fitment?
Check the listing for your year, make, model, trim and engine. Body style, build date and factory options can matter. If the listing is unclear, send FI Performance your vehicle details and the product link or SKU before ordering.
What comes with this part?
Check the product description for quantities, hardware and accessories. Photos may show the part installed with other components. Ask us if you need to confirm whether a part is sold individually, as a pair or as a kit.
Will I need extra parts or modifications?
That depends on the part and your setup. Check for adapters, wiring, coding, tuning, trimming or additional hardware before booking installation. If you already have aftermarket parts, tell us what’s installed.
What should I check for headlights or tail lights?
Match your factory lighting type, connector and body style. Halogen, HID and LED assemblies can differ even on the same model. Check pre-facelift versus facelift fitment and features such as adaptive lights or leveling.
Should I have a shop install it?
We recommend a qualified installer for wiring, engine, brake and suspension work. Inspect the part and confirm fitment before cutting, drilling, painting or modifying anything.
When will my order ship?
Availability and lead time vary by item. If you’re working around a shop appointment or event, contact FI Performance for a current estimate before ordering.
How do returns and warranty claims work?
Contact FI Performance with your order number before sending anything back. Eligibility depends on the item, its condition and the applicable policy. If there’s damage or a defect, keep the packaging and send photos of the part, label and issue.
Is this part intended for street use?
Check the listing for any use restrictions and confirm the requirements where you drive. If you need a specific approval or certification, ask us to verify it for the exact part number before ordering.
Why should I buy from FI Performance?
FI Performance is a USA-based team of automotive enthusiasts focused on quality, reliability and helpful support. We work closely with manufacturers and can help guide your build from product selection through order support.
How can I contact customer support?
Reach FI Performance by live chat, email or phone for product questions, order help and automotive guidance.
What parts are best for my car and goals?
Tell FI Performance your vehicle, intended use and goals. We can help narrow down the right parts and put together a practical modification plan for your build.
Do you offer financing options?
Eligible financing options are shown at checkout. Select the available financing method during checkout to review payment terms and monthly-payment options.
How do I track my order?
When your order ships, FI Performance sends tracking information by email so you can follow delivery progress and view the estimated arrival date.
What payment methods do you accept?
FI Performance accepts major credit cards, PayPal and any financing options displayed at checkout.
How do I know if I have factory Xenon lighting?
Factory Xenon lights commonly have a blue-tinted output and a short warm-up period. Check your owner's manual or send FI Performance your vehicle details so we can help confirm your factory lighting type.
What is the difference between Halogen, HID and LED lighting?
Halogen lighting is the traditional, affordable option. HID lighting typically provides greater brightness, while LED lighting is energy-efficient and long-lasting. FI Performance can help you select the correct option for your vehicle.
How do I prevent lighting condensation?
Condensation can occur as temperatures change. Lighting assemblies are designed to minimize it; contact FI Performance for guidance if you see persistent condensation or have product-specific questions.
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