Stone Exhaust BMW N20 F10 F11 Catless Downpipe for 520i and 528i
Upgrade your BMW 5 Series with the Stone Exhaust BMW N20 catless downpipe and unleash real performance. This decat downpipe is designed specifically for the BMW N20 engine in the F10 and F11 520i and 528i, delivering faster turbo spool, reduced back pressure, improved throttle response and an aggressive exhaust note. If you are searching for BMW N20 downpipe, BMW 520i downpipe, BMW 528i downpipe, F10 downpipe, F11 downpipe, catless downpipe, decat downpipe or turbo downpipe for BMW 5 Series, this is the premium solution engineered for OEM fitment and reliability.
At Nforcd we have fitted this Stone Exhaust downpipe to customer cars and our own development vehicles. Fitment is spot on, quality is excellent and feedback has been outstanding for response, build quality and overall driveability. This is a no-compromise N20 downpipe for enthusiasts who want performance, precision and durability.
Why choose this BMW N20 F10 F11 catless downpipe
- Catless decat design for maximum exhaust flow and reduced turbo back pressure
- One piece construction for smooth gas flow and fewer potential leak points
- Unique flex section helps prevent cracking under extreme heat cycles
- 100% OEM fitment for F10 and F11 520i and 528i with the N20 engine
- Engineered using 3D scanning and reverse engineering for precise routing and clearances
- Mechanical precision welding with crisscross reinforcement at the turbo flange for strength
Engineered for flow, strength and fitment
Stone Exhaust applies advanced R&D to the BMW N20 platform. OEM components are 3D scanned and reverse engineered to analyse diameter, routing and bend angles on the F10 and F11 520i and 528i. Exhaust gas movement, heat zones and pressure areas are simulated to optimise the design before production, resulting in a catless downpipe that efficiently evacuates gases and supports performance tuning.
Production uses a 7 axis CNC bending process to maintain exceptional roundness through bends and minimise outer wall thinning, reducing flow disturbance and the risk of fatigue. Crisscross and overlapping weld techniques at the turbo flange increase penetration and durability at the highest heat load area. Direct spot welding by automated arms ensures consistent, accurate welds and repeatable quality.
Key features at a glance
- Catless downpipe for BMW 520i and 528i with the N20 engine
- One piece design, CNC bent for optimal flow
- Unique flex joint to handle thermal expansion
- Crisscross welding to strengthen the turbo flange
- Mechanical welding with precision
- 3D scanning and reverse engineering
- 100% OEM fitment
Compatibility
N20 engine
- BMW 5 Series F10 520i and 528i 2010–2013
- BMW 5 Series F10 LCI 520i and 528i 2012–2016
- BMW 5 Series F11 520i and 528i 2012–2013
- BMW 5 Series F11 LCI 520i and 528i 2013–2017
Part number
A206P
Fitting and installation
Professional installation recommended. For fitting at Nforcd in Warwickshire, request a quote via Sales@nforcd.com. We know these BMW N20 catless downpipes inside out and can handle installation with care and precision.
Manufacturer and warranty
Manufactured by: Stone Exhaust
Warranty: Stone Exhaust 2 Year Warranty
Search terms to help you find the right part
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