Stone Exhaust BMW B58 Eddy Catalytic Catted Performance Downpipe - M140i M240i 340i 440i 540i 740i X3 M40i X4 M40i Z4 M40i (F20 F22 F30 F32 F33 F36 G30 G31 G11 G12 G01 G02 G29) | Euro 6 UK MOT Friendly High-Flow

Stone Exhaust Eddy Catalytic Sport Cat Downpipe for BMW B58

Give your B58-powered BMW the response and soundtrack it deserves with Stone Exhaust’s Eddy Catalytic sport cat downpipe. This high-flow, road-legal catalyst keeps emissions in check while letting the turbo breathe, delivering quicker spool, crisper throttle and a deeper, more purposeful tone. It remains Euro 6 compliant and MOT safe in the UK, so you can enjoy a true performance upgrade without the hassle.

We have installed this unit on our own demo cars and many customer builds. Fitment is spot on, build quality is superb and the driving improvement is exactly what B58 owners want. Customers consistently praise the workmanship, the OEM-like installation and the real on-road gains.

What makes the Eddy Catalytic sport cat special

• Eddy Catalytic Technology creates a controlled vortex in the core for excellent flow and clean emissions
• Behaves like a dense 400 cpsi catalyst at low rpm for emissions, then flows comparable to a 100 cpsi race cat under load
• Smoother turbo response, stronger mid-range and a richer straight-six soundtrack
• Designed for error-free running on suitable vehicles with no warning lights
• Euro 6 compliant and MOT friendly for UK road use
• Direct replacement using factory mounting points with no cutting required
• Crafted from 304-grade stainless steel for durability and corrosion resistance

Engineering details

• Optimised O2 sensor placement to maintain accurate closed-loop fuelling and drivability
• OEM part 3D scanned for precise routing and heat clearance
• 7-axis CNC bending with up to 98 percent roundness control to minimise restriction
• Reinforced turbo flange area with crisscross, overlapping welds to withstand extreme heat cycles
• Robotic spot welding for consistent penetration and strength
• Computer-optimised tubing diameter and 3D pathing for exact fit

Compatibility – BMW with B58 straight-six turbo

BMW 1 Series

• F20 LCI / F21 LCI M140i / M140i xDrive (2015+)

BMW 2 Series

• F22 M240i / M240i xDrive (2015+)
• F22 LCI M240i / M240i xDrive (2016+)
• F23 M240i / M240i xDrive (2015+)
• F23 LCI M240i / M240i xDrive (2016+)

BMW 3 Series

• F30 LCI / F31 LCI 340i / 340i xDrive (2014+)

BMW 4 Series

• F32 440i / 440i xDrive (2015+), F32 LCI (2016+)
• F33 440i / 440i xDrive (2015+), F33 LCI (2016+)
• F36 440i / 440i xDrive (2015+), F36 LCI (2016+)

BMW 5 Series

• G30 540i / 540i xDrive (2015+)
• G31 540i xDrive (2016+)

BMW 7 Series

• G11 740i (2014+)
• G12 740i / 740i xDrive (2014+/2015+)
• G12 740Li / 740Li xDrive (2014+/2015+)

BMW X Models

• G01 X3 M40i (2016–2018)
• G02 X4 M40i xDrive (2017+)

BMW Z Series

• G29 Z4 M40i (2019+)

Part number

A214E

Manufacturer and warranty

Manufactured by Stone Exhaust

Stone Exhaust 2 Year Warranty

Fitting and support

This is a direct bolt-on replacement for the factory B58 turbo outlet pipe. Professional fitting is recommended. MJ Modifications in Warwickshire can supply and install this product. For a fitting quote, email info@mjmodifications.co.uk.

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