Stone Exhaust BMW N20 Catless Downpipe for E84 E89 F25 F26
Unlock serious performance and sound from your BMW N20 turbo engine with the Stone Exhaust catless downpipe. This high flow decat downpipe is engineered to maximise exhaust gas velocity, reduce back pressure and promote faster turbo spool for sharper throttle response and a more aggressive exhaust note. Perfect for drivers who want a true performance exhaust upgrade for road-legal track days, off-road or motorsport use where permitted.
At Nforcd we have installed and run Stone Exhaust systems ourselves and our customers consistently praise the fit, finish and gains. If you are searching for BMW N20 catless downpipe, BMW X3 downpipe, X4 downpipe, Z4 N20 downpipe, F25 downpipe, F26 downpipe, E84 downpipe, E89 downpipe or a decat downpipe for 20i and 28i models, this is the proven upgrade.
Why choose the Stone Exhaust catless downpipe
- Catless downpipe for BMW N20 turbo engines including X3 20i xDrive, X4 20i xDrive, X3 28i xDrive and X4 28i xDrive.
- Designed for maximum exhaust flow using 3D flow simulation to optimise diameter, routing and bend angles.
- One-piece bend construction to eliminate unnecessary welds and internal weld slag that can restrict flow.
- Unique flex section to absorb heat expansion and prevent cracking under extreme temperatures.
- Crisscross and overlapping welding on the turbo flange to handle 800 to 1100 degrees Celsius thermal stress.
- Precision machine welding by robotic arms for consistent penetration and strength.
- 7-axis CNC mandrel bending achieves up to 98 percent roundness and minimises outer wall wear at tight bends.
- Reverse engineered from OEM using 3D scanning for an exact, 100 percent OEM fitment.
- Direct replacement using factory mounting points for straightforward installation.
Engineering that delivers
Stone Exhaust invests in R&D and 3D scanning to analyse the stock BMW N20 exhaust path, identify bottlenecks and engineer an optimal downpipe solution. Using flow velocity measurement software and thermal pressure simulation, they refined the design until the desired performance was achieved. The result is a high precision, integrally moulded downpipe with accuracy tolerances under 0.025 mm, outstanding roundness and exceptional durability at the turbo connection.
The flange is reinforced with crisscross and overlapping weld techniques to increase weld width and penetration, reducing the risk of failure. Direct spot welding by mechanical arms ensures consistent quality that is difficult to achieve by hand, delivering a robust performance downpipe that looks as good as it performs.
Compatibility
Engine: BMW N20
BMW X Series
- E84 X1-X4 20i/28i (2008 to 2015)
- F25 X3 20i (2013 to 2017) / X3 20i xDrive (2011 to 2017)
- F25 X3 28i (2013 to 2017) / X3 28i xDrive (2009 to 2017)
- F26 X4 20i xDrive (2013 to 2018)
- F26 X4 28i xDrive (2013 to 2018)
BMW Z Series
- E89 Z4 20i/30i (2008 to 2016)
Part Number
A206XP
Manufactured by
Stone Exhaust
Warranty
Stone Exhaust 2 Year Warranty
Professional fitting
Want it fitted right first time? Book professional installation with Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Search-friendly tags and uses
BMW N20 downpipe, BMW N20 catless downpipe, BMW decat downpipe, BMW X3 20i downpipe, BMW X3 28i downpipe, BMW X4 20i downpipe, BMW X4 28i downpipe, BMW F25 downpipe, BMW F26 downpipe, BMW E84 downpipe, BMW E89 Z4 downpipe, turbo downpipe upgrade, performance exhaust downpipe, high flow downpipe, track use downpipe.
Important notes
Catless downpipes are intended for off-road, track or motorsport use where permitted. Check local laws and regulations before purchase and installation.
Photos and video
R&D and 3D scanning
7-axis CNC bending
Art of welding
Video