Stone Exhaust BMW F10 F11 520i 528i Catless Downpipe N20 N26
Transform your BMW 5 Series with the Stone Exhaust catless downpipe for the F10 and F11 520i and 528i. Engineered for the N20 and N26 turbo engines, this high-flow decat downpipe is designed to reduce back pressure, improve exhaust gas velocity and enhance turbo response for a sharper drive and a deeper, more aggressive sound. It delivers 100% OEM fitment for an easy, direct-fit installation.
We have installed this Stone Exhaust downpipe on our own builds and customer cars, and the fitment, weld quality and results have been excellent. Customers consistently praise the precise fit, robust construction and the way it frees up the engine.
Why choose the Stone Exhaust catless downpipe
- Catless downpipe for BMW 520i and 528i with N20 or N26 engines
- Designed to reduce back pressure and optimise flow for faster turbo spool and improved throttle response
- Unique flex section helps prevent fatigue and breakage caused by extreme heat cycles
- Crisscross and overlapping welding on the turbo flange for strength at high temperature
- One piece, integrally moulded design for maximum flow and durability
- Mechanical welding with precision robotic arms to minimise weld contamination inside the pipe
- Reverse engineered with 3D scanning for exact routing, bend angles and clearances
- 7 axis CNC bending technology for exceptional roundness and consistency
- 100% OEM fitment for straightforward installation to the factory system
Engineered for flow and reliability
Stone Exhaust uses 3D scanning and reverse engineering of OEM components to map the ideal pipe diameter, routing and bend angles for the BMW N20 and N26 platforms. Exhaust gas flow, thermal zones and pressure rise points are simulated and refined to achieve optimal performance.
The one piece CNC bent construction achieves outstanding roundness to minimise turbulence, while robotic welding ensures deep, clean welds without ash build-up inside the tube. Crisscross and overlapping welds at the turbo-to-downpipe flange increase penetration and durability in areas exposed to 800°C to 1100°C.
Compatibility
BMW 5 Series F10 and F11 with N20 or N26 2.0 turbo engines, including xDrive where applicable:
- F10 520i and 528i (2010 to 2013)
- F10 LCI 520i and 528i (2012 to 2016)
- F11 520i and 528i (2012 to 2013)
- F11 LCI 520i and 528i (2013 to 2017)
Part number
A206NP
Warranty
Stone Exhaust 2 year warranty.
Professional fitting
We offer professional installation at Nforcd in Warwickshire. For a fitting quote, email Sales@nforcd.com.
Important notes
This is a catless downpipe intended for off-road or track use where permitted. It is not road legal for vehicles used on public highways and may affect emissions compliance and MOT.
Common search terms
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