Stone Exhaust BMW B38 F22 F23 F30 Catless Downpipe (Inc. 218i & 318i)

Stone Exhaust BMW B38 F22 F23 F30 Catless Downpipe (Inc. 218i & 318i)

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Stone Exhaust employs state of the art 3D flow velocity measurement software and the technique of a one-piece mandrel bent pipe design. Using mechanical welding arms to accurately weld stops ash generating in the pipe wall which can cause vapor lock and poor exhaust efficiency. Stone Exhaust’s innovative manufacturing process of the catless downpipe prevents multiple welding positions and vapor lock whilst maximizing efficiency of the exhaust turbine.

 

Features

  • Catless downpipe for 218i with B38 engine.
  • Unique Flex design to prevent breakage caused by extreme heat 
  • Crisscross welding to strengthen turbo flange
  • One Piece Design
  • Machine Welding
  • In House Research and Development
  • 3D Scanning & Reverse Engineering
  • 100% OEM Fitment

 

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 B38 Exhaust Systems.

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

 

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.

     7 Axis CNC Bending Machine | Stone Exhaust USA

     

    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 - Stone Exhaust USA

     

    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 - Stone Exhaust USA

     

    Compatibility - B38 Engine

    BMW 2 Series 

    • F22 218i (2012-2017)/F22 LCI 218i (2016-2019)
    • F23 218i (2014-2017)/F23 LCI 218i (2016-2019)

    BMW 3 Series 

    • F30 LCI 318i (2015+)
    • F31 LCI 318i (2015+)

          

        Warranty

        Stone Exhaust 2 Year Warranty

         

        Manufactured by

        Stone Exhaust

         

        Part Number

        A238P