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Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA
Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA

Stone Exhaust BMW N20 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i)

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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 F30 Sedan 320i, F31 Touring 320i, F32 Coupe 420i, F33 Convertible 420i and F36 Gran Coupe 420i with the N20 engine.

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 our in-house dyno, your BMW exhaust system is proven to produce more power with the enhanced Stone signature exhaust sound.

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

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

  • OEM Integration or Valvetronic System
  • 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
  • Reduces Drone

     

    BMW N20 B48 F30 320i with Stone Exhaust OEM DP + Valvetronic Catback System Sound

     

    BMW N20 F36 420i Full Exhaust Systems Sound

     

    Dyno Result 
    Stone Exhaust BMW N20 B48 F30 F32 Cat-Back Valvetronic Exhaust (Inc. 320i & 420i) | Stone Exhaust USA

     

    Fitted Photo(s) - Dual Exit with Twin Tailpipe

    Stone Exhaust BMW N20 B48 F30 F32 Cat-Back Valvetronic Exhaust(Inc. 320i & 420i) | Stone Exhaust USA

     

    Stone Exhaust BMW N20 B48 F30 F32 Cat-Back Valvetronic Exhaust(Inc. 320i & 420i) | Stone Exhaust USA

     

    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 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

     

    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.

    Valvetronic System | Stone Exhaust USA

     

    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 - N20 Engine

      BMW 3 Series 

      • F30 320i/320i xDrive (2011-2015)
      • F30 LCI 320i (2014-2018)
      • F31 320i (2011-2015)/320i xDrive (2012-2015)
      • F31 LCI 320i/320i xDrive (2014-2018)
      BMW 4 Series 
      • F32 420i/420i xDrive (2013-2017)
      • F32 LCI 420i/420i xDrive (2016-2018)
      • F33 420i (2013-2017)
      • F33 LCI 420i (2016-2018)
      • F36 420i/420i xDrive (2013-2017)

       

      SKU

      AP502 (OEM Integrated Valve(s) / Single Exit (Left) with Twin Tailpipes / Require Original Bumper) 

      AP502N (OEM Integrated Valve(s) / Dual Exit with Twin Tailpipes / Require 335i or 435i Bumper)

      AP502NQ (OEM Integrated Valve(s) / Dual Exit with Quad Tailpipes / Require 335i or 435i Bumper)

      AP502S (Stone Valvetronic System / Single Exit (Left) with Twin Tailpipes / Require Original Bumper)

      AP502NS (Stone Valvetronic System / Dual Exit with Twin Tailpipes / Require 335i or 435i Bumper)

      AP502NSQ (Stone Valvetronic System / Dual Exit with Quad Tailpipes / Require 335i or 435i Bumper)

       

      Warranty

      Stone Exhaust One Year Warranty

       

      Dimension 

      110cm x 33cm x 60cm 

       

      Weight

      19.28 kg 

       

      Emission Notice 

      Various U.S. states and the U.S. federal government have individual laws regulating the use of aftermarket exhaust parts and systems, especially as those parts and systems modify, remove, or replace original equipment catalysts. Please consult the appropriate laws in your area before installing any aftermarket part or system on your vehicle to ensure compliance with all applicable laws.The purchasers are entirely responsible for informing themselves of the applicable laws where the products are to be used and to comply with those laws.


      If you are residing in Europe, Stone’s cat-back exhausts are OPF-compatible, which means you won’t need to code out the OPF or worry about losing your warranty.