Stone Exhaust BMW N20 F25 F26 Cat-Back Valvetronic Exhaust System (Inc. X3 28i & X4 28i xDrive)

Stone Exhaust BMW N20 F25 F26 Cat-Back Valvetronic Exhaust System (Inc. X3 28i & X4 28i xDrive)

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Description

We are proud to introduce you to the state of the art Stone Exhaust Valvetronic Cat-Back Exhaust System, to enhance the performance and sound of your BMW F25 SUV X3 28i & F26 SAV X4 28i xDrive with the N20 engine, manufactured after 2013. 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 Cat-Back Valvetronic System comes with a separate remote controller that gives you full control of the exhaust, allowing you to open and close the valves with a click of a button. You can also set it in auto mode for the valves to open at a certain rpm automatically. The Stone Valvetronic system is a plug and play system, and connects to your OBDII port, which can be installed within a few minutes.

 

Stone Valvetronic System Installation 


 

Features

  • STONE Valvetronic BMW N20 F25 X3 28i & F26 X4 28i xDrive Exhaust System.
  • Valvetronic System
  • Plug and Play OBDII controller
  • One Piece Design
  • Mechanical Welding with Precision
  • In House Research and Development
  • 3D Scanning & Reverse Engineering
  • Remote Control with On / Off / Auto settings
  • Dyno Developed In House
  • Eliminates drone found on the standard exhaust system


BMW N20 F26 X4 28i xDrive With Stone Exhaust Catless DP + valvetronic Cat-back Exhaust System Sound

 

Fitted Photo(s)

Stone Exhaust BMW N20 F25 F26 Catless Downpipe (Inc. X3 28i & X4 28i) - Nforcd UK

 

Stone Exhaust BMW N20 F25 F26 Catless Downpipe (Inc. X3 28i & X4 28i) - Nforcd UK

 

Stone Exhaust BMW N20 F25 F26 Catless Downpipe (Inc. X3 28i & X4 28i) - Nforcd UK

 

Stone Exhaust BMW N20 F25 F26 Catless Downpipe (Inc. X3 28i & X4 28i) - Nforcd UK

 

Stone Exhaust BMW N20 F25 F26 Catless Downpipe (Inc. X3 28i & X4 28i) - Nforcd UK

 

Stone Exhaust BMW N20 F25 F26 Catless Downpipe (Inc. X3 28i & X4 28i) - Nforcd UK

 

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 N20 Exhaust System found on the BMW F25 F26 X3 28i & X4 28i. 

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 - Nforcd UK

 

Valvetronic System

The Stone Valvetronic System was independently researched and developed in house. The system forgoes the conventional design of complicated wiring and the rubber inside the valve which is prone to aging, to ensure longevity.

With the Valvetronic remote control providing three modes to choose from: ON / OFF / AUTO, this allows for instant switching between modes in accordance to driving conditions faced. So, let the STONE Valvetronic System adapt to your vehicle’s needs.

The Valvetronic remote control has 3 modes, ON / OFF / AUTO, which allows you to open and close the valve at a click of a button. The Auto mode allows customization of the opening and closing of the valve at a predefined RPM.

Stone Exhaust BMW N20 F25 F26 Catless Downpipe (Inc. X3 28i & X4 28i) - Nforcd 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 - Nforcd 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 - Nforcd 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 - Nforcd UK

     

    Compatibility - N20 Engine

      BMW X Series
      • F25 X3 28i (2013+)/ X3 28i xDrive  (2009+)
      • F26 X4 28i xDrive (2013+)

      Warranty

      Stone Exhaust 2 Year Warranty

       

      Manufactured by

      Stone Exhaust

       

      Part Number

      AP541BS (Single Exit (Left) with Twin Tailpipes / Require Original Bumper)

      AP536BS (Dual Exit with Twin Tailpipes / Require M40i Bumper)

      AP536BSQ (Dual Exit with Quad Tailpipes / Require M Sport Bumper)