BMW 520D 2.0D (03–06) Turbocharger 49135-05670: The Hybrid Upgrade That Transforms the M47N Diesel
The BMW 520D 2.0D (03–06) Turbocharger 49135-05670 is a highly sought-after upgrade for owners of the E60 and E61 5 Series running the dependable M47N diesel engine. As these vehicles continue to be popular daily drivers and tuning platforms, many enthusiasts are now looking for ways to improve performance, responsiveness and reliability. A hybrid turbocharger offers one of the most effective routes to achieving these gains, delivering sharper throttle feel, stronger mid‑range torque and improved top‑end power without sacrificing everyday usability.
This SEO‑focused guide breaks down what this hybrid turbocharger is, how it works, and why it is considered one of the best performance upgrades for the 520d diesel platform.
What This Turbocharger Is and How It Improves the M47N Diesel
The BMW 520D 2.0D (03–06) Turbocharger 49135-05670 is a direct‑fit hybrid turbo built using the correct OE frame for the M47N engine. Unlike a stock turbo, which is designed to meet factory efficiency and emissions targets, this hybrid unit is engineered for increased airflow, faster response and improved durability under higher boost levels.
This is achieved through several key enhancements:
- A high‑flow TD04 billet aluminium compressor wheel with an extended tip design for greater air delivery
- A fully machined, profiled and polished compressor housing to maximise efficiency
- An uprated 360‑degree thrust bearing to handle increased load and boost pressure
- Precision VSR balancing for smooth, reliable operation at high rpm
These upgrades allow the turbo to move more air more efficiently, supporting higher power output and improved drivability while maintaining OEM‑style fitment and reliability.
Why Enthusiasts Choose This Hybrid Turbo Upgrade
Owners of the 2003–2006 BMW 520d often choose this turbocharger because it offers the perfect balance between performance gains and everyday practicality. Unlike large aftermarket turbos that require custom fabrication or compromise low‑rpm response, this hybrid turbo retains the spool characteristics that make the M47N engine ideal for commuting and long‑distance driving.
Key benefits include:
- Much quicker spool compared to the factory turbo
- Stronger, more consistent mid‑range torque
- Improved top‑end power suitable for remapped diesel setups
- Direct‑fit installation using the original manifold, lines and mounts
- Enhanced durability thanks to the uprated thrust kit and billet components
For anyone searching terms such as "520d diesel turbo upgrade," "BMW M47N hybrid turbo," "E60 520d turbo replacement," or "uprated turbo for 5 Series diesel," this unit consistently proves to be one of the most reliable and effective options available.
Stage 1 and Stage 2 Options Explained
This turbocharger is available in two specifications to suit different tuning goals. Both versions use the same fundamental hybrid design but vary slightly in capability.
Stage 1 Hybrid Turbo
The Stage 1 version is ideal for fast‑road builds and remapped daily drivers. It features a TD04 billet high‑flow compressor wheel, fully machined housing, a 360‑degree thrust kit and VSR balancing. When paired with the right supporting modifications and ECU calibration, Stage 1 typically supports around 230–250 bhp.
Stage 2 Hybrid Turbo
The Stage 2 variant is designed for drivers who want a little more headroom. With similar engineering upgrades but a more performance‑focused calibration, this turbo can support approximately 250–260 bhp depending on hardware, software and engine condition. It is well suited to enthusiasts planning more advanced tuning or running upgraded fueling systems.
Direct Fitment for the BMW E60 and E61 520d
The BMW 520D 2.0D (03–06) Turbocharger 49135-05670 fits all E60 and E61 5 Series models running the M47N 2.0‑litre diesel engine. Because it is built on the correct OE frame, installation is straightforward and requires no custom fabrication. It attaches directly to the stock manifold and connects to the original oil and coolant lines.
Common cross‑reference numbers include 49135‑05610, 49135‑05620, 49135‑05640, 49135‑05641, 49135‑05670 and 49135‑05671.
Reconditioned Exchange Units Available
For owners seeking a more budget‑friendly option, reconditioned hybrid turbos are also available on an exchange basis. These refurbished units are fully rebuilt and upgraded, providing a cost‑effective way to enjoy hybrid performance while maintaining OE fitment and reliability.
Real‑World Performance Gains
Workshops and owners who have installed the BMW 520D 2.0D (03–06) Turbocharger 49135-05670 consistently report noticeable improvements. Customer feedback highlights faster spool, smoother power delivery through the rev range and impressive torque gains, particularly when paired with a high‑quality remap and supporting hardware such as a clean intercooler, free‑flowing intake and healthy fueling system.
These results make the hybrid turbo one of the best upgrades for breathing new life into older 5 Series diesel models.
Installation and Support
Although the turbo is designed as a direct replacement, professional installation is recommended to ensure correct oil priming, fitment and testing. MJ Modifications in Warwickshire offer fitting, mapping advice and setup support for this hybrid turbo. Drivers can request a fitting quote via info@mjmodifications.co.uk.
Important Considerations Before Upgrading
Like any performance modification, results depend on the condition of the vehicle and the quality of the supporting components. Owners should ensure that:
- The engine is healthy and free from boost leaks
- The oil supply is clean and of the correct grade
- All priming and installation steps are followed carefully
- The ECU is mapped safely for the new turbo
Power estimates for both Stage 1 and Stage 2 versions are approximate and vary between vehicles. Proper maintenance remains essential for long‑term reliability.
A Proven Upgrade for BMW 520d Owners
For drivers wanting more performance from their E60 or E61 diesel, the BMW 520D 2.0D (03–06) Turbocharger 49135‑05670 offers an outstanding blend of usability, power potential and reliability. With fast‑road calibration, billet components and OE‑fit convenience, it remains one of the best hybrid turbo upgrades for the M47N platform.
Whether you are restoring lost performance, preparing for a remap or aiming for a reliable 230–260 bhp build, this turbocharger delivers strong results and excellent long‑term value.