Mercedes-Benz W213 AMG E400 E43 Valvetronic Exhaust System - Yonristic Performance

This exhaust system is centered around a large 3.5-inch midpipe, designed to dramatically reduce backpressure compared to the factory layout. The increased cross-section allows exhaust gases to move more freely, improving turbo response on the E400 and sharpening overall engine behavior on the AMG-tuned E43. By maintaining high flow capacity through the mid-section, the system ensures consistent performance even under sustained load or spirited driving.

At the rear, the exhaust transitions into a valved dual-path muffler design. With the valves closed, exhaust gases are routed through a controlled internal path that keeps sound levels refined and cabin noise minimal—ideal for commuting, highway cruising, or long-distance driving. Open the valves using the included remote valve control system, and the exhaust shifts to a more direct flow route, delivering a louder, deeper, and more aggressive tone with crisp throttle response and pronounced overrun characteristics.

The system is engineered using precise underbody measurements to ensure perfect fitment, proper clearance, and OEM-style mounting. All sections are hand TIG-welded for strength and longevity, with smooth transitions and consistent wall thickness to preserve exhaust velocity. The result is a system that not only sounds better, but also feels sharper and more responsive throughout the rev range.

Performance Gains

Thanks to the high-flow midpipe and reduced exhaust restriction, the system delivers tangible performance benefits:

• Horsepower Gain:
  +15–22 HP at higher RPM

• Torque Gain:
  +18–25 lb-ft, especially noticeable in the mid-range

• Throttle Response:
  Improved turbo spool and sharper acceleration response

These gains are achieved without ECU tuning, though additional power can be unlocked when paired with aftermarket software.

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Key Specifications

Configuration

• Performance cat-back exhaust system

• 3.5-inch high-flow midpipe

• Dual rear mufflers with active valve control

Valve Control

• Included remote valve control module

• On-demand switching between quiet and aggressive modes

• Independent of factory drive modes for maximum flexibility

Materials & Construction

• Available in AISI 304 Stainless Steel

• Hand TIG-welded construction

• Precision-formed piping with smooth internal transitions

• Heat-resistant design for long-term durability

Installation

• 100% bolt-on design

• Utilizes factory mounting points

• No cutting or welding required

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Vehicle Fitment

• Mercedes-Benz W213 E400 – 2014–2018

• Mercedes-AMG W213 E43 – 2016–2018

• Engine Platforms: Turbocharged V6 variants