Stone Exhaust Eddy Catalytic Downpipe for BMW N26 F10 F11 520i and 528i
Unlock real-world performance and stay emissions friendly with the Stone Exhaust Eddy Catalytic Downpipe for the BMW 5 Series F10 and F11 520i and 528i with the N26 engine. This high flow catted downpipe uses Stone’s patented eddy catalytic technology to deliver stronger low-end torque, faster turbo spool and top-end power similar to a 100 cell sports cat, while maintaining clean emissions performance comparable to a 400 cell catalytic converter. Designed for error-free running with no check engine light, it is a direct bolt-on upgrade with OEM-level fitment.
If you are searching for a BMW 520i catted downpipe, BMW 528i catted downpipe, BMW F10 downpipe, BMW F11 downpipe, N26 catted downpipe or high flow sports cat for BMW 5 Series, this Stone Exhaust solution is the premium choice for daily-driven performance and reliability.
Why choose the Eddy Catalytic Downpipe
- Patented eddy catalytic technology creates a controlled vortex that purifies exhaust gases while maintaining optimal back pressure for power and drivability
- Stronger low rpm torque with crisp throttle response and improved turbo spool
- Top-end flow that feels like a 100 cell sports cat, with low rpm cleanliness similar to a 400 cell cat
- Designed to run without error codes or check engine lights
- Real-time O2 sensor positioning for accurate readings and smooth power delivery
- Special 3D design and scanning for 100 percent OEM fitment with no modification required
- SUS304 premium grade stainless steel for durability and corrosion resistance
- Dual cross-welding at the turbo flange for strength under extreme heat
- UK MOT friendly and Euro 6 compliant
What we have seen in use
We have fitted and used this Stone Exhaust downpipe on customer N26 BMW 520i and 528i F10 and F11 cars, and feedback has been consistently excellent. Drivers report noticeably stronger midrange, smoother boost build and a more engaging exhaust note without unwanted cabin drone. It is the ideal catted downpipe upgrade for a fast road BMW 5 Series that still needs to pass UK emissions checks.
Engineering and build quality
Stone Exhaust engineers reverse-engineer the OEM system via comprehensive 3D scanning to identify the best pipe route, diameter and bend angles for the N26 platform. Computational simulation is then used to model exhaust gas flow, temperature and pressure zones before any metal is cut.
Production is carried out on a 7 axis CNC bending machine to achieve exceptional roundness and consistency, minimising flow disruption and weld stress. Crisscross and overlapping welding techniques are used at the turbo flange where temperatures can exceed 800 to 1100 degrees Celsius, dramatically improving longevity. Direct spot welding by precision mechanical arms ensures deep, accurate penetration for a robust, leak-free assembly.
Fitment and compatibility
Engine: BMW N26
BMW 5 Series
- F10 520i and 528i including xDrive 2010 to 2013
- F10 LCI 520i and 528i including xDrive 2012 to 2016
- F11 520i and 528i including xDrive 2012 to 2013
- F11 LCI 520i and 528i including xDrive 2013 to 2017
Part number
A206NE
Installation
Direct bolt-on fit with factory mounting points. Professional installation recommended. For fitting by specialists, choose Nforcd in Warwickshire. Request a competitive fitting quote at Sales@nforcd.com.
Search-friendly terms
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Manufacturing images
Below are examples of Stone Exhaust engineering, scanning and welding quality.
