Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System
  • Load image into Gallery viewer, Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System

Stone Exhaust BMW N55 F20 F21 M135i OEM Integrated Valved Catback Exhaust System

Regular price
£2,584.32
Sale price
£2,584.32
Regular price
£3,230.40
Sold out
Unit price
per 
Tax included. Shipping calculated at checkout.

Description

We are proud to introduce you to the state of the art Stone Exhaust OEM Integrated Valve Catback Exhaust System, to enhance the performance and sound of your BMW F20 5 Door & F21 3 Door M135i with the N55 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 Valve option allows your exhuast 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 (Singe Valve) which enables you to control the valves remotely via the stone remote controller.

 

Features

  • OEM Integration
  • Available to add-on Stone Valvetronic System
  • Plug and Play OBDII controller
  • One Piece Design
  • Mechanical Welding with Precision
  • In House Research and Development
  • 3D Scanning & Reverse Engineering
  • Dyno Developed In House
  • Eliminates drone found on the standard exhaust system

 

BMW N55 F20 M135i with Stone Exhaust Catless Downpipe + Valvetronic Cat-back System Sound

 

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 N55 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 - 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 - N55 Engine

    BMW 1 Series 

    • F20 M135i /M135i xDrive (2011+)
    • F20 LCI M135i /M135i xDrive (2015+)
    • F21 M135i (2011+) /M135i xDrive (2012+)
    • F21 LCI M135i /M135i xDrive (2015+)

     

    PLEASE NOTE: 

    This exhaust has been made to adjustable to enable use with any diffuser. It will therefore need to be cut at the end pipe in order to suit desired diffuser.


    Warranty

    Stone Exhaust 2 Year Warranty

     

    Manufactured by

    Stone Exhaust

     

    Part Number

    AP504A