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Stone Exhaust

Stone Exhaust BMW B58D G20 G21 OEM Integrated Valved Catback Exhaust System - OPF Model (M340i & M340i xDrive)

Stone Exhaust BMW B58D G20 G21 OEM Integrated Valved Catback Exhaust System - OPF Model (M340i & M340i xDrive)

Regular price $3,457.00
Regular price Sale price $3,457.00
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Fitting service at Xatrix, West Yorkshire

We can offer a fitting service for this part. Contact us for a fitting quote.

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We are proud to introduce you to the Stone OEM Integrated Valve Catback Exhaust, to enhance the performance and sound of your BMW G20 Sedan M340i & G21 Touring M340i Drive with the B58D engine, manufactured after 2018. Stone Exhaust has been developing world's best exhaust system since 1998, starting with 3D scanning and reverse engineering the OEM system, this allows the Stone engineers to design a 100% OEM fitment exhaust with precision. With their in-house dyno, your BMW exhaust system is proven to produce more power with the enhanced Stone signature exhaust sound.

The OEM Integred Valves option allows your exhaust system to operate as standard, where the onboard computer (ECU) will control the opening and closing of the valves automatically.

 

You may wish to add the Stone Valvetronic System (Dual Valves) which enables you to control the valves remotely via the stone remote controller.

 

  • OEM Integration
  • Optional Stone Valvetronic System available
  • OPF Exhaust Design
  • Plug and Play OBDII controller
  • One Piece Design
  • Machine Welding
  • In House Research and Development
  • 3D Scanning & Reverse Engineering
  • Dyno Developed In House
  • Eliminates drone found on the standard exhaust system

 

OPF Delete

Stone offers an OPF delete, which can be included free of charge, this allows you to install the Stone Cat-Back exhaust system on OPF equipped cars without throwing an error code, thus coding out the OPF error code on the ECU is not required.

 

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 B58D Exhaust System found on the M340i & M340i 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.

Stone Exhaust System 3D Scanning Reverse Engineering UK - ML Performance UK

 

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’s 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.

    Stone Exhaust System UK Bending - ML Performance UK

     

    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.

    Stone Exhaust Art of Welding - ML Performance UK

     

    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.

    Stone Exhaust Art of Welding - ML Performance UK

     

    AP546NB

     

    Manufactured by

    Stone Exhaust

     

    Warranty

    Stone Exhaust 2 Year Warranty


    BMW B58D G21 M340i xDrive with Stone Exhaust Eddy Catalytic DP + Valvetronic Cat-back System sound

     

    Fitted Photo(s) - Dual Exit with Quad Tailpipes

     

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