Stone Exhaust Mercedes-Benz C-Class W205 S205 C205 (M264/4MATIC) Cat-Back Valvetronic Valved Exhaust - C180 C200 C250 C300 (incl. C300 4MATIC) OPF Delete + OBD Remote MP505SM264

Mercedes C-Class W205/S205/C205 M264 Valved Catback with OBD Control and GPF/OPF Solution

Transform the character of your C-Class with Stone Exhaust’s electronically valved catback designed for the M264 turbo petrol platform. Developed using precision 3D scanning, reverse engineering and in-house dyno validation, this system delivers a richer tone, improved gas flow and a refined, drone-free cruise on saloon, estate and coupé variants. It is a direct-fit upgrade for C180, C200, C250 and C300 models, including 4MATIC.

Expect crisp cold starts, a deeper soundtrack under load and calm refinement on the motorway. We run Stone systems on our own and customer cars; feedback on sound quality, fitment and day-to-day usability has been superb.

Key reasons enthusiasts choose this system

• Electronic valve control with ON, OFF and AUTO modes for instant sound management
• OBD plug-in controller for clean, plug-and-play setup
• OEM-style fit achieved via 3D scan data and reverse-engineered geometry
• Dyno-developed for optimised flow and the signature Stone tone
• One-piece construction with precision mechanical welding for strength and reliability
• Advanced 7-axis CNC bending for accurate pipe roundness and smooth airflow
• Engineered to reduce cabin boom and minimise drone at cruising speeds

Simple valve control via remote

Choose your soundtrack:

• ON for a louder, more aggressive note
• OFF for discreet, refined operation
• AUTO to open and close at a pre-set RPM for the best of both worlds

The supplied OBD controller makes the install tidy and reversible, with no splicing.

OPF/GPF support included

A complimentary GPF/OPF solution is included to prevent warning lights on particulate filter–equipped vehicles. No ECU coding is required to suppress OPF-related errors.

How it’s engineered

• 3D scanning and reverse engineering for precise mounting on W205, S205 and C205 platforms
• 7-axis CNC mandrel bends maintain roundness even at tight radii
• Crisscross and overlapping welds at stress points for long-term durability
• Direct spot welding by mechanical arms for consistent, strong joints
• Refined on the dyno for balanced performance and everyday comfort

Compatibility

Engines: M264 and M264 4MATIC

Body styles: W205 Saloon, S205 Estate, C205 Coupé

Models:

• W205 C180 7G-TRONIC PLUS 2014+
• W205 C200 7G-TRONIC PLUS 2014+
• W205 C250 2014+
• W205 C300 and C300 4MATIC 2014+
• S205 C200 and C200 7G-TRONIC PLUS 2014+
• S205 C250 2014+
• C205 C200, C200 7G-TRONIC, C200 9G-TRONIC 4MATIC 2016+
• C205 C250 2016+
• C205 C300 2014+

Part number

MP505SM264

Installation and fitting

Professional installation is recommended. For fitting, book with MJ Modifications in Warwickshire and request a quote: info@mjmodifications.co.uk.

Warranty

Stone Exhaust 2 Year Warranty

Videos

Stone Valvetronic System Installation

Sound preview: W205 C300 with Stone Exhaust

Gallery

Search terms to help you find the right upgrade

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