Stone Exhaust Valvetronic Valved Cat-Back/Catback for Mercedes CLA45 AMG (C117/X117) M133 | CLA 45 4MATIC Coupe & Shooting Brake | Switchable/Active Sports Exhaust System | OBD2 Remote Valve Control | Drone-Free | OPF/GPF Compatible

Stone Exhaust MP510S Switchable Sports System for Mercedes CLA 45 C117 and X117 Shooting Brake

Transform the character of your Mercedes-Benz CLA 45 with Stone’s switchable sports system. This precision rear section and mid-pipe upgrade delivers a deeper, cleaner tone with no motorway resonance, crisp gear changes and instant control of the exhaust flaps via a simple plug-in OBD2 handset. Developed using full 3D scanning, reverse engineering and in-house dyno validation, it fits like factory and sounds genuinely premium.

We have installed this setup at MJ Modifications and the feedback from CLA 45 owners has been fantastic. Customers love the mature cabin manners for daily use, then the addictive soundtrack on-throttle when the valves are opened. If you are hunting for a CLA 45 sports exhaust in the UK, a switchable back box for C117, or a performance system for the X117 Shooting Brake with the M133 engine, this is the one to own.

Highlights

• Designed for Mercedes-Benz CLA 45 4MATIC C117 and X117 Shooting Brake with the M133 engine
• Active valve control using a plug-in OBD controller with Close, Open and Auto modes
• Auto mode lets you choose the RPM point for flap activation
• No cabin boom on cruise for relaxed long-distance driving
• One-piece, high-flow pipework for reliability and consistent performance
• OEM-level fit thanks to 3D scanning and reverse engineering of the factory system
• R&D and dyno development for measurable gains and a refined tone
• Crisscross and overlapping welding in high-heat zones for strength
• Robotic direct spot welding for repeatable quality
• 7-axis CNC mandrel bending for up to 98 percent roundness at tight radii which maintains gas velocity

OPF compatibility

An OPF solution is available free of charge. This enables fitment to OPF-equipped cars without dash warnings, which means no ECU coding is required.

How it sounds and drives

Close the valves for a calm, refined drive. Open them for a purposeful, motorsport-inspired note with sharp overrun character. The motorway is free from unwanted resonance, yet the car comes alive when you want it to. With the OBD plug-in controller you can switch modes instantly or let Auto take care of things by RPM.

Built to last

Precision 7-axis bending minimises outer bore wear at 180 degree bends to reduce turbulence and prevent stress cracking. Combined with reinforced weld techniques and robotic spot welding, you get a durable, high-quality system that looks as good as it sounds.

Compatibility

• Mercedes-Benz CLA-Class C117 CLA 45 AMG 4MATIC
• Mercedes-Benz CLA-Class X117 CLA 45 AMG 4MATIC Shooting Brake
• Engine code: M133

Part number

MP510S

What you get

• Stone Exhaust cat-back assembly for M133 C117 and X117
• OBD2 plug-in valve controller with remote operation
• Hardware for installation

Professional installation

Want it fitted properly first time? Book with MJ Modifications in Warwickshire. We have hands-on experience with this setup and can install and configure the valve controller for you. Request a fitting quote at info@mjmodifications.co.uk.

Gallery

Manufacturer

Stone Exhaust

Warranty

Stone Exhaust 2-year warranty

Search-friendly terms

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