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Stone Exhaust

Stone Exhaust BMW Toyota B58D Catless Downpipe OPF (Inc. A90 Supra, G29 Z4 M40i, G20 M340i & G20 M340i xDrive)

Stone Exhaust BMW Toyota B58D Catless Downpipe OPF (Inc. A90 Supra, G29 Z4 M40i, G20 M340i & G20 M340i xDrive)

Regular price £1,081.58 Inc. VAT
Regular price £1,201.75 Sale price £1,081.58 Inc. VAT

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Fitting service at Xatrix, West Yorkshire

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In order to get even better efficiency for the section of exhaust turbine, as well as to prevent multiple welding positions in the downpipe section, which generates ash in the pipe while welding, causing bad exhaust efficiency, and then generates vaper lock and thus inability to exhaust, Stone Exhaust uses a variety of smart ideas in downpipe design. The company employs flow velocity measurement software in 3D and the technique of one-piece bend pipes, along with mechanical arms which accurately welds without generating ash in the pipe wall in order to further exhaust efficiency of Catless Downpipe. It is a perfect and effective product which has surpassed all similar products in the market.

 

  • Catless downpipe for A90 Supra, G29 Z4 M40i,  G20 M340i & G20 M340i xDrive (OPF)
  • Unique Flex design to prevent breakage caused by extreme heat 
  • Crisscross welding to strengthen turbo flange
  • One Piece Design
  • Mechanical Welding with Precision
  • 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 B58D Exhaust System found on the A90 Supra, G20 M340i & G20 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 BMW B58 F20 F21 M140i Cat-Back Valvetronic Exhaust System - 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 BMW B58 F20 F21 M140i Cat-Back Valvetronic Exhaust System - 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 BMW B58 F20 F21 M140i Cat-Back Valvetronic Exhaust System - 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 BMW B58 F20 F21 M140i Cat-Back Valvetronic Exhaust System - ML Performance UK

  

B58D Engine

BMW

 

3 Series

  • G20 340i/340i xDrive (2018+)
  • G21 340i xDrive (2018+)

Z Series

  • G29 Z M40i (2019+)

      Toyota 

      Supra

      • A90 Supra (2020-Present)

       

      A223P

       

      Manufactured by

      Stone Exhaust


      Warranty

      Stone Exhaust 2 Year Warranty