BMW 18539880004RS Borgwarner Turbocharger N55

( Manufacturer Part Number: 18539880004RS ), ( Type: Turbocharger ), ( Oe/oem Part Number: 11657583904 )

Review BMW Borgwarner Turbocharger N55 fits E70 X5

Introducing the BMW BorgWarner EFR Turbocharger, part number 18539880004, specifically designed for BMW X5 models equipped with the N55 engine and the E70 chassis. This high-performance turbocharger is an essential upgrade for those seeking enhanced power, responsiveness, and driving dynamics.

The BMW BorgWarner EFR Turbocharger is engineered with advanced technology and precision manufacturing. It features a compact and efficient design, with a smaller size and lower weight compared to traditional turbochargers. This results in improved throttle response and increased power output, delivering a more exhilarating driving experience.

The heart of this turbocharger is its advanced EFR (Efficient Front Radiator) technology. The EFR design utilizes a cooled, integrated charge air cooler that improves cooling efficiency and reduces the size of the turbocharger. This not only enhances performance but also contributes to improved fuel economy and reduced emissions.

The BMW BorgWarner EFR Turbocharger is built to withstand the rigors of high-performance driving. It is made from high-strength materials, including a robust forged steel compressor wheel and a durable cast aluminum turbine housing. This ensures that the turbocharger can handle the increased pressures and temperatures that come with high-performance driving, providing reliable and consistent performance.

This turbocharger is also engineered for easy installation. It comes with all necessary hardware and instructions for a straightforward installation process. Additionally, it is designed to be a direct replacement for the original BMW turbocharger, making it a plug-and-play upgrade for BMW X5 N55 owners.

In summary, the BMW BorgWarner EFR Turbocharger, part number 18539880004, is an excellent choice for BMW X5 N55 owners looking to enhance the performance of their vehicle. With its advanced EFR technology, compact design, and durable construction, this turbocharger delivers improved power, responsiveness, and driving dynamics. Its easy installation process makes it a convenient and effective upgrade for any BMW enthusiast.

The BMW BorgWarner EFR turbocharger for the E70 X5 with the N55 engine is a popular aftermarket upgrade for those seeking to improve their vehicle's performance. Here are some pros and cons associated with purchasing this turbocharger:

1. Increased Power: The primary reason for installing a turbocharger is to boost power output. This turbocharger can help increase horsepower and torque, resulting in better acceleration and improved overall performance.

2. Improved Engine Responsiveness: Turbochargers help reduce lag, making the engine more responsive and delivering power more consistently across the rev range.

3. Better Fuel Efficiency: While not always the case, some users report improved fuel efficiency due to the more efficient combustion process provided by the turbocharger.

4. Enhanced Driving Experience: The added power, improved responsiveness, and potential fuel efficiency gains contribute to a more enjoyable driving experience.

1. Cost: Turbochargers can be expensive to purchase and install. The cost includes not only the turbocharger itself but also labor, installation parts, and any necessary engine modifications.

2. Complex Installation: Installing a turbocharger requires a significant amount of technical knowledge and expertise. It is recommended to have the installation done by a professional to ensure proper fitment and functioning.

3. Potential Increased Wear and Tear: Turbochargers put additional stress on the engine, potentially leading to increased wear and tear over time. Regular maintenance and monitoring are crucial to ensure the longevity of the engine and the turbocharger.

4. Potential Negative Impact on Emissions: Turbochargers can potentially increase emissions due to the increased fuel consumption and combustion temperatures. However, modern turbochargers are designed to minimize these impacts and meet emissions standards.

The BMW BorgWarner EFR turbocharger for the E70 X5 with the N55 engine can provide significant performance improvements, making it an attractive option for enthusiasts. However, it comes with additional costs, complex installation, and potential increased wear and tear on the engine. Careful consideration, proper installation, and regular maintenance are crucial to ensure the benefits outweigh the drawbacks.

For those seeking improved performance from their E70 X5 with the N55 engine, a BMW BorgWarner EFR turbocharger can be a worthwhile investment. It is important to ensure the installation is done by a qualified professional, and regular maintenance is carried out to ensure the longevity of the engine and the turbocharger. Additionally, consider the potential impact on fuel efficiency, emissions, and the overall cost before making the purchase.

Details:

Borgwarner is a BMW OEM. BMW part. Part number RS. My loss is your gain this turbo brand new from BorgWarner over $2000.

Its still in box unopened bought from BR Turbo which sells remanufactured OEM turbochargers. This product comes in original packaging remanufactured. I purchased this turbocharger in summer 2025 but ended up not needing it due to mechanic misdiagnosis.

part #: 18539880004rs prices

• $300.00-$2436.41

specifications turbiparts:

• for models: E70, X5
• for makes: Bmw
• mpn: 18539880004rs
• type: Turbocharger
• oe/oem part number: 11657583904

returns turbiparts:

• policy: No Returns

shipping turbiparts:

• carrier: USPS
• transit: 5-12 Days
• cost: $0.00
• class: Standard
• type: Calculated
• service: USPS Ground Advantage

payments turbiparts:

• other
• wallet: Google-pay
• credit card: Mastercard

general turbiparts:

• Air Fuel Delivery > Turbos, Superchargers Intercoolers > Turbos Parts
• condition: Remanufactured

offer turbiparts:

• sold: 0
• quantity: 1
• best offers: True
• started: January 10, 2026
• availability: In Stock
• options: Ship-to-home

seller turbiparts:

• # reviews: 657
• rating: 100.0%
• city: Germantown, Tennessee

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