Meet the latest patented technology that adheres to the world's increasingly stringent environmental regulations, at the same time enhances performance to another level on your BMW B58 M140i, M240i, 340i, 540i, 740i, X3/X4 M40i xDrive. In comparison to commercially available linear frustums, the "eddy catalytic technology" adopts an arc-packaging method. The turbine emissions process produces a vortex effect which purifies the exhaust gases while maintaining an equal amount of back pressure. When compared to a variety of conventional straight downpipes, the patented eddy catalytic technology can effectively increase horsepower and torque. In the lower rpm you will be immerse with vast amount of torque until you reach higher rpm where the vortex effect really comes to life and opens up the Catalytic, resulting in a performance similar to a 100 CELL Catalytic. However in the lower rpm, the catalytic will produce efficient and clean emission similar to a 400CEL Catalytic and produce no Check Engine Lights, completely error free.

• Patented O2 sensor technology design provides real-time data performance by accurately sensing every rotating displacement.
• No more delayed in power delivery
• Using one of the rare noble metal to help efficiently filter out exhaust gas.
• Computer simulation to obtain the best diameter.
• Special 3D design to achieve 100% OEM fitment, no-modification required.
• SUS304 Premium Grade Stainless steel.
• Dual Cross-Welding Technology providing substantial increase durability at the turbo Flange.
• UK MOT friendly and Euro 6 Compliant

R&D and 3D Scanning

Stone Exhaust engineers use reverse engineering by 3D scanning OEM parts to understand their functionality and identify weaknesses. Data has been collected continuously in order to analyze factors such as pipe diameter, route and degrees of the bending angles of the B58 Exhaust System found on the M140i, M240i, 340i, 540i, 740i, X5 40i xDrive & X6 40i xDrive.

During R&D, Stone Exhaust utilizes the 3D simulation software to stimulate the exhaust gas flow movement, thermal and pressure rise zone. Progressive improvements were continually made until the optimal performance was achieved.

7 Axis CNC Bending Machine

Stone Exhaust System are constructed utilizing a 7 axis CNC Bending Machine which is the ultimate machine for high levels of precision delivery, necessary for industries such as the aerospace and defense industries.

With the state-of-the-art bending machine, Stone Exhaust has achieved the industry standard to an impressive 98% roundness, whilst maintaining the wear of the outer bore at only 25% at 180°. Airflow obstruction and welding fracture problems are prevented by utilizing this technology. With the combination of the CNC Bending machine, Reverse Engineering and 3D Design Scanning, Stone exhaust has created an integrally molded exhaust pipe with an accuracy error under 0.025mm.

Crisscross and Overlapping Welding Technique

The flange between the turbo and the downpipes reaches extreme temperatures (800 to 1100 which creates stress on the connection point. By utilizing both welding techniques to increases the width and penetration of welds. This increases the endurance and tolerance of these connection points, leading to quality products with reliable performance.

Direct Spot Welding

Our highly skilled engineers perform direct spot welding to increase product strength. This is undertaken by mechanical welding arms, proven to achieve greater precision and penetration in their welds compared to manual welding, resulting in an end product that is a work of art.

Art of Welding

B58 Engine

BMW 1 Series

• F20 LCI/F21LCI 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/F31LCI 340i/340i xDrive (2014+)

BMW 4 Series

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

BMW 5 Series

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

BMW 7 Series

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

BMW X Series

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

BMW Z Series

• G29 Z4 M40i (2019+)

A214E

Manufactured by

Stone Exhaust

Warranty

Stone Exhaust 2 Year Warranty

Fitted Photo(s)