BMW 51128050378 Rear Bumper Lower Muffler Dual Exhaust Cover Diffuser Sport

( Manufacturer Part Number: 51128050378 ), ( Type: Bumper Cover ), ( Oe/oem Part Number: Cover, Bumper, Rear ), ( Color: Black ), ( Material: Plastic ), ( Vintage Part: No ), ( Country Of Origin: Germany ), ( Placement On Vehicle: Lower, Rear )

Review BMW Original Factory Genuine Rear Bumper Lower Muffler Dual Exhaust Diffuser Trim Cover Sport fits 650 2011–2018

The **BMW 6 Series (G12/G13) Rear Bumper Lower Muffler Dual Exhaust Diffuser Cover (Part #51128050378)** is a precision-engineered aftermarket component designed to enhance both the aesthetic and functional performance of your 2011 2018 BMW 650i Sport. Crafted from high-quality, durable materials, this diffuser cover seamlessly integrates with the factory exhaust system while delivering a sleek, aggressive stance that accentuates the sporty character of your vehicle. The design features a dual-exhaust configuration, ensuring optimal airflow and exhaust efficiency, which not only improves engine performance but also contributes to a deeper, more resonant exhaust note. The cover is meticulously contoured to match the contours of the rear bumper, providing a seamless, factory-like finish that eliminates unsightly gaps or misalignments. Constructed with corrosion-resistant materials, this component is built to withstand the rigors of daily driving, ensuring long-term durability even in harsh weather conditions. Whether you're seeking to elevate the visual appeal of your BMW or enhance its performance, this diffuser cover is an ideal choice for enthusiasts who demand both style and substance. Its precise fitment ensures easy installation, allowing for a hassle-free upgrade that instantly transforms the rear profile of your 650i Sport.

### **Pros and Cons of buying a BMW 6 Series (F12/F13, 2011 2018) Rear Bumper Lower Muffler/Dual Exhaust Diffuser Cover (Part #51128050378)**

1. **OEM Quality and Fit** This is a genuine BMW part, meaning it is designed to match the factory specifications of your vehicle. It should fit perfectly without modifications, ensuring proper alignment with the bumper, exhaust, and diffuser.

2. **Aesthetic Consistency** The part maintains the original styling of your BMW, preserving the sporty, aggressive look of the rear diffuser and exhaust system. This is particularly important for owners who prioritize a factory-like appearance.

3. **Durability** BMW s OEM components are built to last, often with high-quality materials like reinforced plastics, steel, or aluminum. This part is exposed to road debris, heat, and vibrations, so a well-made OEM piece reduces the risk of premature wear or failure.

4. **Exhaust System Integration** The muffler/diffuser cover works in tandem with the exhaust system, helping to direct airflow and reduce noise. A properly fitted OEM part ensures optimal performance and compliance with emissions standards.

5. **Resale Value Protection** If you plan to sell your BMW in the future, keeping OEM parts intact can help maintain its value. Aftermarket modifications, especially non-genuine ones, can sometimes deter buyers.

6. **Warranty Coverage** Purchasing directly from BMW or an authorized dealer may include warranty protection, offering peace of mind against defects in materials or workmanship.

7. **Compatibility with Other OEM Parts** Since this is an OEM component, it is designed to work seamlessly with other genuine BMW parts, reducing the likelihood of compatibility issues if you replace related components (e.g., exhaust pipes, mufflers, or diffuser).

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1. **High Cost** OEM BMW parts are significantly more expensive than aftermarket alternatives. The price for this specific part can range from **$500 to $1,200 **, depending on the seller, region, and whether it includes labor. This makes it a costly upgrade or replacement.

2. **Limited Customization** Unlike aftermarket parts, OEM components do not offer design variations (e.g., different colors, finishes, or aggressive styling). If you want a unique look, aftermarket options may provide more flexibility.

3. **Longer Lead Times** OEM parts, especially for older BMW models like the F12/F13, may not be readily available in stock. You might need to order it, which could take **weeks or even months**, depending on the supplier.

4. **Potential for Counterfeit Parts** When buying from third-party sellers (e.g., eBay, Amazon, or non-authorized dealers), there is a risk of receiving **fake or low-quality OEM parts**. Always verify the seller s authenticity and part origin to avoid this issue.

5. **Labor Costs** Installing this part may require professional labor, especially if it involves disconnecting the exhaust system or adjusting the diffuser. Labor costs for BMW mechanics can be **$150 $300 per hour**, adding to the total expense.

6. **Weight and Performance Impact** While minimal, OEM parts may be slightly heavier than aftermarket alternatives. This could have a negligible effect on performance but is something to consider if you prioritize lightweight modifications.

7. **Environmental and Ethical Concerns** OEM parts contribute to e-waste and resource consumption. If sustainability is a concern, aftermarket or refurbished parts might be a more eco-friendly alternative.

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The **BMW 6 Series (F12/F13) Rear Bumper Lower Muffler/Dual Exhaust Diffuser Cover (51128050378)** is a **high-quality, reliable, and visually consistent** OEM part that ensures a factory-like appearance and proper function. It is ideal for owners who:

- Want to **maintain their BMW s original look and value**.

- Prioritize **durability and long-term reliability**.

- Are willing to **invest in genuine components** without compromising on fit or performance.

However, the **high cost, limited customization, and potential lead times** make it less appealing for budget-conscious buyers or those seeking **aggressive styling modifications**. If you re open to alternatives, aftermarket parts (from reputable brands like **BMS, Eibach, or Akrapovic**) may offer similar performance at a fraction of the cost, though with trade-offs in fit and warranty.

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- You are replacing a **damaged or missing** component and want **perfect fitment**.

- You are **restoring or maintaining** your BMW s original specifications.

- You have **verified the seller s authenticity** (preferably from BMW or an authorized dealer).

- Budget is not a constraint, and you value **long-term reliability**.

- You want **cost savings** (aftermarket parts can be **30 70% cheaper**).

- You are open to **custom styling** (e.g., carbon fiber, aggressive diffusers, or performance exhausts).

- You are willing to **source high-quality aftermarket brands** (e.g., **BMS, Eibach, or local BMW specialists**).

- You can **install it yourself** to avoid labor costs.

- **Avoid third-party sellers without verification** Always check for **authentic BMW part numbers, seller ratings, and return policies** to prevent counterfeit parts.

For the best balance of **cost, quality, and performance**, research **aftermarket options** that match your aesthetic and functional needs before committing to the OEM part. If you decide to go OEM, **purchase from a trusted source** to ensure you get a genuine, high-quality component.

Details:

IT CAME OUT OF A 2012 BMW 650xi with 87502 MILES.

part #: 51128050378 prices

• $107.96-$398.67

specifications vintagecarbumperus:

• for models: 650
• for makes: Bmw
• for years: 2011-2018
• mpn: 51128050378
• type: Bumper Cover
• oe/oem part number: Cover, Bumper, Rear
• color: Black
• material: Plastic
• vintage part: No
• country of origin: Germany
• placement on vehicle: Lower, Rear

seller vintagecarbumperus:

• rating: 99.4%
• city: Garland, Texas
• # reviews: 7404

shipping vintagecarbumperus:

• class: Economy
• carrier: FedEx
• service: FedEx Ground Economy
• transit: 3-6 Days
• type: Fixed
• cost: $25.00

returns vintagecarbumperus:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

offer vintagecarbumperus:

• sold: 0
• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: April 12, 2026

general vintagecarbumperus:

• Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers
• condition: Used

payments vintagecarbumperus:

• wallet: Apple-pay
• other
• credit card: Diners-club

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