BMW 51118063421 Sport Left Lower Bumper Grille G31 M550I 173

( Manufacturer Part Number: 51118063421 ), ( Part Type: Bumper Grille ), ( Placement On Vehicle: Front, Left ), ( Country Of Origin: Germany )

Review BMW Series G31 Sport Left Lower Bumper Grille #173 fits G30 530I 2017–2018

The **BMW 51118063421 (2017-2018 G30/G31 M550i/530i Sport Left Lower Bumper Grille 173)** is a precision-engineered aftermarket part designed to enhance both the aesthetic appeal and structural integrity of BMW s fifth-generation luxury sedans, including the **G30 5 Series (530i/540i/550i)** and the **G31 5 Series Gran Turismo (530i/540i/550i)**. This left-side lower bumper grille assembly, part of BMW s **iDrive 7.0/8.0** generation lineup, is crafted to seamlessly integrate with the vehicle s sport-tuned suspension and aggressive styling cues, offering a sleek, modern look that complements the **M550i s performance-oriented DNA** or the **530i Sport s refined elegance**. The **173** designation indicates a specific trim-level fitment, ensuring compatibility with models featuring the **LED matrix headlights, kidney grille accents, and optional carbon fiber or alloy wheel packages**, which are hallmarks of BMW s premium sport sedan lineup.

Constructed from high-quality **polypropylene or reinforced ABS plastic**, this bumper grille is engineered to withstand the rigors of daily driving, from minor road debris to occasional low-speed impacts, while maintaining its sharp, aerodynamic contours. The design incorporates **integrated side skirts and integrated lower bumper guards**, which not only improve aerodynamics but also provide additional protection for the vehicle s undercarriage, particularly in off-road or urban environments where curb impacts are a concern. The **left-side orientation** ensures proper alignment with the vehicle s left-hand drive configuration, allowing for a flawless fitment without the need for modifications to the existing bumper structure.

Beyond its functional benefits, this bumper grille is a statement piece, enhancing the **G30/G31 s aggressive yet refined silhouette** with its **sharp, angular lines and integrated LED accents** a signature element of BMW s **DesignWorksUSA** styling philosophy. The **M550i-specific version** may feature subtle **M Sport badging or unique venting**, while the **530i Sport variant** maintains a more understated yet sporty appearance, with a focus on clean, uncluttered lines that emphasize the vehicle s luxury and performance balance. Whether installed as part of a full restomod project or as a standalone upgrade, this bumper grille elevates the **5 Series presence**, making it stand out on the road while preserving the original manufacturer s intent for both form and function.

For enthusiasts seeking a **direct fitment solution** without the need for custom fabrication, this part is a **drop-in replacement** for the stock bumper grille, ensuring compatibility with **2017-2018 model-year vehicles** equipped with the **G30 (sedan) or G31 (Gran Turismo) body styles**. It is compatible with a range of **wheel sizes and tire widths**, making it a versatile choice for those upgrading to **19-inch or 20-inch alloy wheels** while maintaining proper ground clearance. Additionally, the **left-side focus** ensures that the part aligns perfectly with the vehicle s **left-hand drive steering and suspension geometry**, preventing any clearance issues with the steering column, brake lines, or exhaust components. Whether paired with a **full underbody paint job, blacked-out trim, or a more subtle matte finish**, this bumper grille is a **must-have accessory** for owners looking to refine their **5 Series appearance** while maintaining its performance-driven heritage.

### **Pros and Cons of buying a BMW 51118063421 (2017-2018 G30/G31 M550i/530i Sport Left Lower Bumper/Grille Part #173)**

#### **Overview**

This part is a **left lower bumper and grille assembly** for the **2017-2018 BMW 5 Series (G30/G31)**, specifically for the **M550i and 530i Sport models**. It is a **genuine BMW replacement part**, likely OEM or BMW-approved, ensuring compatibility and quality.

---

### **Pros**

1. **Genuine or High-Quality Replacement**

- If this is an **OEM or BMW-approved part**, it will match the original fit, finish, and durability. Aftermarket parts may vary in quality, while genuine parts ensure a seamless integration with the vehicle s aesthetics and functionality.

- The **M550i and 530i Sport** models have distinct styling, and a proper bumper/grille ensures the car retains its premium look.

2. **Enhanced Aesthetics**

- The **5 Series (G30/G31) has a sleek, aggressive front end**, especially in the **M550i and 530i Sport trims**, which feature **sharp LED headlights, a sportier grille, and a more aggressive bumper design**.

- A well-fitted bumper/grille assembly improves the car s appearance, making it look like it was never damaged.

3. **Improved Functionality**

- The bumper absorbs minor impacts, protecting the vehicle s front structure. A damaged or poorly fitted bumper can lead to **structural weaknesses** in a collision.

- The grille ensures proper airflow to the **radiator and cooling system**, preventing overheating critical for performance-oriented models like the **M550i**.

4. **Compatibility with Aftermarket Mods**

- If you plan to modify the front end (e.g., **carbon fiber grille, LED upgrades, or body kits**), a **high-quality bumper/grille** provides a solid base for these modifications.

- Some aftermarket parts require a **specific bumper design** for proper attachment, so ensuring the right fit is essential.

5. **Resale Value Protection**

- A well-maintained front end with **no visible damage** helps maintain the **resale value** of the vehicle. The **5 Series holds its value well**, and cosmetic integrity is a key factor for buyers.

6. **Durability (If Genuine)**

- Genuine BMW parts are built to last, often with **rust-resistant coatings** and **high-quality plastics/metal**. Aftermarket parts may degrade faster, especially in harsh weather conditions.

7. **Warranty Coverage (If Purchased from Authorized Dealer)**

- If bought from a **BMW dealership or authorized BMW parts supplier**, the part may come with a **limited warranty**, providing peace of mind against defects.

---

### **Cons**

1. **High Cost (Compared to Aftermarket Alternatives)**

- **Genuine BMW bumper/grille assembly** may cost **$800 $1,500 ** (depending on labor if installed by a dealer).

- **Aftermarket parts** (from reputable brands like **ABS, Dura, or Mann Filter**) can cost **$300 $600**.

- If the budget is tight, aftermarket options (with good reviews) can be a cost-effective alternative.

2. **Potential for Counterfeit Parts**

- If purchasing from a **third-party seller (e.g., eBay, Facebook Marketplace, or non-authorized dealers)**, there is a risk of **counterfeit or low-quality parts**.

- Unusually low prices (too good to be true).

- No **BMW part number verification**.

- Poor packaging or lack of documentation.

- **Recommendation:** Buy from **authorized BMW dealers, reputable online retailers (like **BMWDirect, RockAuto, or local BMW specialty shops**), or verified sellers with positive reviews.

3. **Installation Complexity**

- **Disconnecting electrical connections** (for LED modules, sensors, and cooling fans).

- **Removing fasteners** (some are **hidden or require special tools**).

- **Realigning the grille and bumper** for a perfect fit.

- **DIY installation is challenging** for beginners, and **mistakes can lead to misalignment or damage**.

- **Labor costs** at a BMW dealership can add **$200 $500 ** to the total expense.

4. **Weight Considerations**

- Genuine BMW bumpers are **heavier** than some aftermarket alternatives, which may slightly affect **handling and fuel efficiency** (though the difference is minimal in most cases).

5. **Availability & Lead Times**

- **Genuine parts may have longer lead times**, especially if the vehicle is no longer in production.

- **Aftermarket parts are usually available faster**, reducing downtime.

6. **Potential for Hidden Damage**

- **Rust around fasteners and seams**.

- **Cracks in plastic components**.

- **Misalignment in the grille or bumper**.

7. **Environmental & Ethical Concerns (If Buying Used/Recycled)**

- Some sellers offer **"refurbished" or "reconditioned" parts**, which may come from **salvage yards or accident-damaged vehicles**.

- **Ethical concerns** arise if the part was taken from a **wrecked car** without proper recycling.

- **Recommendation:** Prefer **new or certified pre-owned parts** when possible.

---

### **Key Considerations Before Purchase**

1. **Verify the Part Number & Fitment**

- Ensure the **BMW part number (51118063421)** matches your **exact model year and trim (2017-2018 G30/G31 M550i/530i Sport)**.

- Some **aftermarket parts may not fit perfectly** due to slight design variations.

2. **Source Matters Where to Buy?**

- **Best Option:** **Authorized BMW dealer** (highest quality, warranty).

- **Good Alternative:** **Reputable online retailers** (RockAuto, BMWDirect, Amazon (sold by BMW-approved sellers)).

- **Budget Option:** **High-quality aftermarket brands** (ABS, Dura, Mann Filter, Meyle).

- **Avoid:** Random eBay sellers, unknown Facebook Marketplace dealers, or parts with no return policy.

3. **Installation DIY vs. Professional?**

- **DIY:** Only attempt if you have **mechanical experience** and the **right tools** (torque wrench, plastic trim tools, etc.).

- **Professional:** If unsure, have a **BMW specialist or body shop** install it to avoid **misalignment or electrical issues**.

4. **Budget vs. Value**

- If the part is **damaged or scratched**, consider whether **repair vs. replacement** is cost-effective.

- **Aftermarket parts can save money** if the quality is comparable (check reviews).

5. **Warranty & Return Policy**

- Ensure the seller offers a **warranty or return policy** in case of defects.

- **Genuine BMW parts** often come with a **limited lifetime warranty** on labor (if installed by a dealer).

---

### **Final Recommendation**

You **prioritize authenticity and long-term durability** (e.g., keeping the car in **showroom condition**).

You **have the budget** for a **genuine BMW part** and want to avoid aftermarket inconsistencies.

You **plan to sell the car later** and want to **maximize resale value**.

You **have access to professional installation** (to ensure a perfect fit).

You **trust the seller** (authorized dealer or verified online retailer).

You are on a **tight budget** and can find a **highly rated aftermarket part** (e.g., **ABS or Dura**).

You **have mechanical experience** and are comfortable with **DIY installation**.

The part is **only for functional repair** (not cosmetic perfection).

You **cannot find the genuine part quickly** and need a **faster solution**.

1. **Check for genuine parts first** (BMW dealer or BMWDirect).

2. **Compare prices** with **top-tier aftermarket brands** (ABS, Dura, Mann Filter).

3. **Verify the seller s reputation** (read reviews

Details:

530i drive 2017 - 2018. 530e drive 2018 - 2018. 530I 2017 - 2018. #173: Fits:: 530e 2018 - 2018.

part #: 51118063421 prices

• $51.45-$249.99

specifications vintagecarbumperus:

• for models: G30, 530i
• for makes: Bmw
• for years: 2017-2018
• mpn: 51118063421
• part type: Bumper Grille
• placement on vehicle: Front, Left
• country of origin: Germany

shipping vintagecarbumperus:

• transit: 3-7 Days
• service: Standard
• class: Standard
• type: Fixed
• cost: $19.99

payments vintagecarbumperus:

• credit card: Discover
• wallet: Paypal
• other

general vintagecarbumperus:

• condition: New other see details
• Exterior Parts Accessories > Bumpers Components > Bumper Inserts Covers

offer vintagecarbumperus:

• quantity: 1
• best offers: True
• started: March 17, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock

returns vintagecarbumperus:

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

seller vintagecarbumperus:

• # reviews: 23423
• rating: 99.9%
• city: Linden, New Jersey

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