Meet the latest technology that adheres to the world's increasingly stringent environmental regulations at the same time enhances performance to another level. In comparison to commercially available linear frustums, the "eddy catalytic technology" adopts an arc-packaging method. The turbine emissions process produces a vortex effect which purifies the exhaust gases while maintaining an equal amount of back pressure. When compared to a variety of horsepower tests and straight downpipes, our patented eddy catalytic technology can effectively increase horsepower and torque.

• Patented O2 sensor technology design provides real-time data performance by accurately sensing every rotating displacement. No more delayed or error code problem.
• Using one of the rare noble metal to help efficiently filter out exhaust gas.
• Computer simulation of the best diameter.
• A special 3D design able to achieve a perfectly matching model with the original pipe. the same installation applies, no need to modify.
• SUS304 Stainless steel.
• Dual Cross-Welding Technology providing substantial increase durability.
• UK MOT friendly and Euro 6 Compliant

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 Exhaust System found on the Mercedes-Benz AMG M274 C200, C250, C300, E250, E300, GLC250 & GLC300.

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.

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.

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.

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.

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.

M274/M264 4MATIC Engine

Mercedes-Benz C-Class

• W205 C180 7G-TRONIC PLUS (2014+)
• W205 C200 7G-TRONIC PLUS (2014+)
• W205 C250 (2014+)
• W205 C300/ C300 4MATIC (2014+)
• S205 C200/C200 7G-TRONIC PLUS (2014+)
• S205 C250 (2014+)
• C205 C200/C200 7G-TRONIC/C200 9G-TRONIC 4MATIC (2016+)
• C205 C250 (2016+)
• C205 C300 (2014+)

 Mercedes-Benz  E-Class

• W213 E250 (2017+)
• W213 E300 (2017+)
• C238 E250 (2017+)
• C238 E300 (2017+)

Mercedes-Benz  GLC-Class

• X253 GLC250 4MATIC (2015+)
• X253 GLC300 (2015+)
• X253 GLC300 4MATIC (2015+)
• C253 GLC250 Coupe 4MATIC (2015+)
• C253 GLC300 Coupe (2015+)
• C253 GLC300 Coupe 4MATIC (2015+)

M208E

Warranty 

Stone Exhaust 2 Year Warranty

Mercedes Benz AMG M274 W205 C300 with Stone Exhaust Eddy Catalytic DP + Valvetronic Catback Sound