BMW 51-71-7-031-942 Front Deflector

( Manufacturer Part Number: 51-71-7-031-942 ), ( Part Type: Deflector ), ( Year: 2008 2009 ), ( Parts Included: Only Part Reference 1 On The Diagram Is Included ), ( Manufacturer Warranty: 1 Year ), ( Genuine Oem: Yes ), ( Universal Fitment: Direct Replacement )

Review BMW Genuine Front Deflector fits 535I 2008–2009

The **BMW 51-71-7-031-942 front deflector** is a precision-engineered aftermarket component designed to enhance both the aerodynamic performance and visual appeal of BMW vehicles, particularly those in the 5 Series (E39, E60, E61) and select models from the 7 Series (E38, E65/E66) lineup. Crafted from high-quality, durable materials, this deflector is meticulously shaped to redirect airflow over the vehicle s hood, reducing drag and improving stability at high speeds while also contributing to a sleeker, more aggressive stance. The part features a seamless, aerodynamic contour that integrates smoothly with the factory front bumper and grille area, ensuring a clean, factory-like appearance without the bulkiness of aftermarket spoilers or air dams. Its robust construction, often made from reinforced plastic or lightweight composite materials, is engineered to withstand the rigors of daily driving, including exposure to UV rays, road debris, and minor impacts, while maintaining its structural integrity over time. Beyond its functional benefits, the deflector adds a subtle yet noticeable sporty flair to the vehicle s front end, complementing the aggressive lines of BMW s signature design language. Whether installed for performance gains, aesthetic enhancement, or both, this component serves as a versatile upgrade that aligns with BMW s commitment to precision engineering and driver-focused innovation.

### **Pros and Cons of Buying a BMW 51 (E12), 71 (E23), 7 (E28/E32), 031 (E34), or 942 Front Deflector**

#### **Pros**

1. **Aerodynamic Efficiency** Front deflectors improve downforce and stability at high speeds, reducing lift and improving handling, especially for long-distance driving or highway cruising. This is particularly beneficial for heavier or high-performance models like the BMW 942.

2. **Enhanced Cooling** The deflector helps direct airflow over the hood, improving engine bay cooling by reducing turbulence and allowing better heat dissipation, which can be useful in stop-and-go traffic or high-temperature conditions.

3. **Improved Fuel Economy** By reducing drag and optimizing airflow, a well-designed deflector can slightly improve fuel efficiency, though the impact varies depending on driving conditions and vehicle setup.

4. **Aesthetic Appeal** A properly fitted deflector can give the car a more aggressive, sport-tuned look, aligning with BMW s performance-oriented image. Some aftermarket options are designed to match the vehicle s styling cues.

5. **Compatibility with Other Modifications** If you re planning other aerodynamic upgrades (e.g., rear spoilers, side skirts), a front deflector can complement them by creating a more cohesive aerodynamic package.

6. **Potential Resale Value Boost** For enthusiasts or collectors, a well-maintained BMW with performance-oriented modifications (including aerodynamic upgrades) may appeal to buyers looking for a more tuned or unique vehicle.

7. **Reduced Wind Noise** Some deflectors are designed to smooth airflow over the hood, which can minimize wind noise at highway speeds, improving cabin comfort.

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#### **Cons**

1. **Minimal Real-World Performance Gain** While deflectors improve aerodynamics in theory, the practical benefits are often modest. The impact on handling, braking, or fuel economy is usually subtle unless the vehicle is heavily modified or driven at very high speeds consistently.

2. **Potential for Poor Fitment** Aftermarket deflectors may not align perfectly with the original body lines, leading to gaps, misalignment, or an unrefined appearance. Poor fitment can also affect airflow negatively, negating some benefits.

3. **Installation Complexity** Fitting a deflector may require drilling, welding, or adhesive application, which can be labor-intensive and may void the vehicle s warranty if done improperly. Professional installation is recommended but adds to the cost.

4. **Cost** High-quality aftermarket deflectors (especially OEM-style or carbon fiber options) can be expensive, ranging from $200 to over $1,000 depending on the model and material. DIY kits may be cheaper but still require tools and expertise.

5. **Maintenance and Durability Concerns** Plastic or fiberglass deflectors may degrade over time due to UV exposure, impact damage, or poor adhesive bonding. Metal options are more durable but heavier and may require professional fabrication.

6. **Potential for Overkill** For daily drivers, the benefits of a deflector may not justify the cost and effort. The improvements are more noticeable in performance or track-oriented setups rather than casual use.

7. **Legal and Insurance Considerations** Some regions have strict regulations on aerodynamic modifications, and insurance companies may view them as high-risk, potentially increasing premiums or requiring additional inspections.

8. **Compatibility Issues with Original Components** Improperly fitted deflectors can interfere with hood release mechanisms, sensors, or cooling systems, leading to functional issues or safety concerns.

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### **Conclusion**

A front deflector for a BMW (E12 5-Series, E23/E28/E32 7-Series, E34 5-Series, or 942) can be a worthwhile addition if you prioritize aerodynamics, cooling, or aesthetics but it is not a universal upgrade. The benefits are most tangible for performance-oriented drivers, long-distance travelers, or those planning a comprehensive aerodynamic tune. However, for casual drivers, the gains may be negligible, and the cost or installation hassle may not be justified.

If you decide to proceed, opt for a high-quality, professionally fitted deflector that matches your vehicle s body lines. Prioritize materials that balance durability and weight (e.g., carbon fiber or reinforced plastic over cheap aftermarket options). Always ensure compatibility with your specific model s design and consider consulting with a BMW specialist or aerodynamic tuner for optimal results.

### **Recommendation**

- **Buy if:** You drive frequently at high speeds, prioritize cooling efficiency, or are building a performance-oriented BMW with other aerodynamic upgrades. The deflector should be part of a cohesive package (e.g., with a rear spoiler or lowered suspension).

- **Skip if:** You use the car primarily for daily commuting, budget is a concern, or you prefer a minimalist approach. In such cases, the benefits may not outweigh the costs.

- **Alternative:** If you re unsure, test a deflector on a track or high-speed road to evaluate the perceived difference in handling or comfort before committing to a full installation.

Details:

Electrical parts are not returnable. Accurate fitment for all BMW model's. We proudly support BMW drivers, independent repair facilities, and DIY enthusiasts throughout the Chicago land area across country. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

Parts must be resalable and in the original packaging.

part #: 51717031942 prices

• $322.01-$326.02

specifications ocoosys:

• for models: 535i
• for makes: Bmw
• for years: 2008-2009
• mpn: 51-71-7-031-942
• part type: Deflector
• year: 2008 2009
• parts included: Only Part Reference 1 On The Diagram Is Included
• manufacturer warranty: 1 Year
• genuine oem: Yes
• universal fitment: Direct Replacement

general ocoosys:

• condition: New
• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components

payments ocoosys:

• other
• credit card: Discover
• wallet: Apple-pay

shipping ocoosys:

• transit: 4-11 Days
• cost: $58.21
• class: Standard
• service: Standard
• type: Fixed

offer ocoosys:

• availability: In Stock
• options: Ship-to-home
• started: June 11, 2026
• sold: 0
• quantity: 4

seller ocoosys:

• city: Elmhurst, Illinois
• rating: 99.1%
• # reviews: 640

returns ocoosys:

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

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