BMW Exhaust Bolt 11-62-1-704-717 840CI

( Manufacturer Part Number: 11621704717 ), ( Part Type: Exhaust Bolt ), ( Ipn: 11-62-1-704-717 )

Review BMW Genuine Oem Exhaust Bolt 840ci fits 540I 740IL 740I M5 Z8

The **BMW N63 11621704717 Exhaust Bolt** is a precision-engineered, high-performance fastener specifically designed for the iconic **N63 twin-turbocharged inline-six engine** found in BMW s legendary **540i, 740iL, 740i, 840Ci, M5 (F10/F11/F12/F13), and Z8** models. Crafted from **high-grade 12.9-grade steel**, this bolt is engineered to withstand the extreme thermal and mechanical stresses imposed by the aggressive exhaust system and high-performance applications, ensuring reliable sealing and structural integrity under demanding conditions. The **hex head design** features a **fine-threaded, left-hand thread** (M12x1.5), allowing for secure, vibration-resistant installation in the exhaust manifold or turbocharger housing, where proper sealing is critical to prevent exhaust gas leaks and maintain optimal engine efficiency. Its **black oxide finish** not only enhances corrosion resistance but also provides a sleek, professional appearance that complements the high-end aesthetics of BMW s performance-oriented vehicles. Whether used in stock applications, aftermarket modifications, or competitive tuning scenarios, this bolt delivers the durability and precision required to handle the intense heat and pressure generated by the N63 s twin-turbo setup. Built to meet BMW s stringent quality standards, it is a direct-fit replacement for OEM components, ensuring compatibility with stock and modified exhaust systems while minimizing the risk of leaks or premature failure. For enthusiasts seeking reliability in their exhaust assembly, this bolt is an essential component for maintaining the integrity of the N63 s exhaust flow and overall performance.

### **Pros and Cons of buying a 11621704717 Exhaust Bolt for BMW (E39 540i, 740iL, 740i, 840Ci, M5, Z8)**

1. **OEM Quality and Fitment** This bolt is an original BMW part, meaning it is designed to match the exact specifications of your vehicle s exhaust system. It ensures proper alignment, torque, and sealing, reducing the risk of leaks or premature wear.

2. **Durability and Reliability** BMW s aftermarket and genuine parts are typically made from high-quality materials, including stainless steel or coated bolts, which resist corrosion and high temperatures better than generic replacements.

3. **Prevents Exhaust Leaks** A faulty or missing exhaust bolt can cause leaks, which not only degrade performance but also allow harmful exhaust gases to enter the cabin. Using the correct bolt ensures a secure fit and prevents such issues.

4. **Compatibility with Aftermarket Mods** If you ve installed aftermarket exhaust systems (e.g., headers, mufflers, or catalytic converters), using the correct bolt ensures proper integration without compromising structural integrity.

5. **Warranty Considerations** If your vehicle is still under warranty, using OEM parts may help avoid voiding coverage if an issue arises due to improper aftermarket components.

6. **Ease of Installation** Since it s a standard part, installation is straightforward, requiring only basic tools (socket wrench, torque wrench, and possibly a penetrating oil if rusted).

7. **Long-Term Cost Savings** While the upfront cost may be higher than a cheap aftermarket bolt, using the correct part reduces the likelihood of repeated failures, saving money on repairs down the line.

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1. **Higher Cost** Genuine BMW parts are more expensive than generic or aftermarket alternatives. The price may be a barrier for budget-conscious buyers, especially if multiple bolts are needed.

2. **Potential for Overkill** If the bolt is only slightly damaged or loose, some owners might opt for a cheaper replacement without needing the full OEM part. In such cases, a high-quality aftermarket bolt (e.g., from a reputable brand like Fel-Pro, EBC, or Mucoff) could suffice.

3. **Availability and Lead Times** Genuine BMW parts may not always be in stock at local auto parts stores. Purchasing online (e.g., from BMW dealers, RockAuto, or Amazon) may require waiting for shipping, which can be inconvenient for urgent repairs.

4. **Misidentification Risk** If the wrong bolt is ordered (e.g., confusing it with a different model or year), it may not fit properly. Double-checking the part number and vehicle compatibility is essential to avoid waste.

5. **Over-Torquing Risk** While OEM bolts are designed for proper torque, inexperienced installers might over-tighten them, leading to stripped threads or bolt failure. Always follow the manufacturer s torque specifications (typically 80 100 Nm for exhaust bolts on these models).

6. **Environmental and Ethical Concerns** Genuine BMW parts come from recycled or new manufacturing processes, which may have a higher environmental impact than some aftermarket alternatives. However, this is a minor consideration compared to performance and reliability.

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### **Conclusion**

The **11621704704 (note: you listed 11621704717, but the correct bolt for E39 exhaust systems is often 11621704704 or similar double-check your part number)** is a **highly recommended choice** for BMW E39 (540i, 740i, 840Ci, M5) and Z8 owners when replacing exhaust bolts. Its **OEM quality, durability, and compatibility** make it the safest and most reliable option, especially for long-term use or high-performance applications. However, if the bolt is only slightly damaged and budget is a concern, a **high-quality aftermarket bolt (e.g., from Fel-Pro or EBC)** can be a cost-effective alternative without sacrificing performance.

**For most serious BMW enthusiasts, the genuine part is worth the investment** to ensure a leak-free, durable exhaust system and avoid potential issues with aftermarket knockoffs.

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1. **Verify the Correct Part Number** Confirm that **11621704717** is indeed the correct bolt for your specific application (some E39 models may use **11621704704** or **11621704716**). Check BMW s parts catalog or consult a trusted mechanic if unsure.

2. **Purchase from a Reputable Source** Buy from **BMW-authorized dealers, RockAuto, or trusted online retailers** to ensure authenticity and avoid counterfeit parts.

3. **Use Proper Installation Techniques** Clean threads, apply thread locker (e.g., Loctite 271), and torque to the **specified value (check your workshop manual)** to prevent leaks or stripping.

4. **Consider Aftermarket Alternatives if Budget is Tight** If the bolt is only slightly worn, a **Fel-Pro or EBC exhaust bolt** (often sold as a kit) can be a reliable and cheaper option.

5. **Inspect the Entire Exhaust System** While replacing the bolt, check for **rust, cracks, or damaged hangers** in the exhaust manifold or downpipe, as these can lead to future issues.

**Final Verdict:** **Buy the genuine BMW bolt (11621704717 or verified alternative) if possible** for the best long-term results. If cost is a factor, a **high-quality aftermarket bolt** is a reasonable compromise. Always prioritize **correct fitment and installation** over price.

Details:

Include the Vehicle Identification Number VIN. Genuine OEM Exhaust Bolt For BMW 540I, 740IL, 740I, 840Ci, M5, Z8: Product Overview. Provide photos of the defect if possible along with an explanation its nature. If a part malfunctions during this period, please get in touch with us.

If you live outside the USA, please research and verify it fits your vehicle before purchasing. Normal wear and tear or incorrect installation are not covered under warranty.

part #: 11621704717 prices

• $17.40-$25.02

specifications emissyste:

• for models: 540i, 740il, 740i, M5, Z8
• for makes: Bmw
• mpn: 11621704717
• part type: Exhaust Bolt
• ipn: 11-62-1-704-717

seller emissyste:

• # reviews: 1355461
• rating: 99.5%
• city: Nashville, Tennessee

offer emissyste:

• availability: In Stock
• started: March 30, 2026
• sold: 0
• quantity: 10
• options: Ship-to-home

shipping emissyste:

• service: Standard
• cost: $0.00
• class: Standard
• transit: 3-7 Days
• type: Fixed

returns emissyste:

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

payments emissyste:

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

general emissyste:

• condition: New
• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

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