Stone Exhaust switchable catback for Mercedes E‑Class V8 Biturbo 2016 onwards
Give your E‑Class performance saloon or estate the soundtrack and response it deserves. This Stone Exhaust rear section upgrade brings a crisp motorsport tone when the valves are open and calm refinement when closed, with bolt-on precision that fits like factory. It is the ideal upgrade for owners seeking a premium valve‑controlled system for the AMG 4.0 twin‑turbo V8.
Engineered using full 3D scanning and reverse engineering of the original system, Stone achieves OEM-level alignment and clearance while improving gas flow. The package includes a plug‑in controller that connects to the diagnostic port, giving you instant command of the valves via the supplied remote, plus an included GPF/OPF workaround so you can fit to particulate filter cars without warning lights or ECU coding.
Highlights
- Designed for E‑Class AMG V8 Biturbo saloon and estate from 2016 onwards
- Valve‑controlled sound with three modes: Open, Closed and Auto
- Plug‑in control through the OBD port with handheld remote
- Refined cruising with minimal cabin resonance compared with stock
- One‑piece layout for strength, alignment and easy installation
- Developed on in‑house dynos for measurable performance improvements
- GPF/OPF solution included, no coding required
How the valve control works
Select Open for maximum character and flow, Closed for neighbour‑friendly driving, or Auto to let the system manage valve position by engine speed. The controller is truly plug‑in, reversible and neat, with no cutting of factory wiring.
Craftsmanship that stands out
Stone utilises advanced 7‑axis CNC bending to maintain cross‑section integrity through every curve. Overlapping and crisscross welding at high‑heat joints enhances durability, while robotic spot welding ensures consistent, repeatable quality. The result is a beautifully built upgrade that slots into place and elevates your AMG experience the moment you start the car.
Our experience
We have installed and run this setup on customer cars and the feedback has been superb. Owners praise the sharp, authentic AMG tone with valves open and the peaceful motorway manners with valves shut. It is exactly the balance you want in a daily‑driven performance E‑Class.
Vehicle compatibility
- Mercedes‑Benz E‑Class E63 and E63 S 2016 onward, saloon and estate
- 4.0‑litre twin‑turbo V8 platform
- Chassis codes commonly known as W 213 and S 213
Key features in detail
- Switchable valve technology with Open, Closed and Auto modes
- OBD port controller and remote included for quick install
- One‑piece construction for strength and perfect alignment
- 3D scanned and reverse engineered for factory‑level fitment
- Advanced welding techniques for longevity under high temperatures
- Developed and validated on Stone’s own dynamometers
- Noticeably reduced drone relative to the factory system
- Includes OPF/GPF warning suppression solution
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Installation and support
Want it fitted. MJ Modifications offers professional installation at our Warwickshire facility. Email info@mjmodifications.co.uk for a quote and booking.
Warranty
Stone Exhaust 2‑year warranty.
Part number
SKU: MP521S
