The Yonristic Performance Valved Cat-Back Exhaust System for the Mercedes-Benz CLS 450 (C257) is engineered to elevate the driving experience of Mercedes’ elegant four-door coupe. Designed specifically for the 2.0L turbocharged inline-four with EQ Boost hybrid assistance, this system enhances both performance and sound while preserving the CLS’s signature luxury character.

Unlike the restrictive factory exhaust, the Yonristic system introduces a true 3-inch high-flow architecture, reducing backpressure, improving exhaust gas evacuation, and refining throttle response. The result is a CLS 450 that feels more responsive, sounds more engaging, and delivers a deeper, more refined exhaust note without compromising daily comfort.

This system is fully integrated with factory valve control, allowing seamless transitions between quiet refinement and dynamic performance sound at the push of a button.

True 3-Inch High-Flow Cat-Back Design

At the core of the system is a precision-engineered 3-inch mandrel-bent cat-back exhaust, designed to maximize exhaust flow from the turbocharged inline-four engine.

By increasing exhaust diameter and optimizing internal routing, the system significantly improves flow efficiency and reduces restriction.

Performance Benefits

• Reduced exhaust backpressure
• Improved turbo spool efficiency
• Sharper throttle response
• Enhanced mid-range torque delivery
• More linear power feel
• Improved exhaust gas evacuation

The result is a more dynamic and responsive driving experience, especially during acceleration and highway passing.

Signature Yonristic Muffler Engineering

The CLS 450 exhaust features a specially developed Yonristic muffler architecture, tuned specifically for turbocharged inline engines with hybrid EQ Boost assistance.

This design balances refinement and aggression, producing a sound profile that is:

• Deep and smooth at idle
• Refined during cruising
• Stronger and more expressive under acceleration
• Clean and controlled at high RPM

Unlike overly loud aftermarket systems, this exhaust is engineered to preserve the CLS’s luxury identity while unlocking its hidden performance character.

Factory Valve Integration with Dual Sound Personality

The Yonristic CLS 450 exhaust is fully compatible with the OEM Mercedes-Benz exhaust valve system, allowing seamless integration with factory drive modes.

Valve Operation Modes

Valves Closed

• Quiet and refined cabin experience
• Ideal for city driving and long trips
• Reduced exhaust volume for comfort

Valves Open

• Deeper and more aggressive exhaust tone
• Stronger turbo presence
• Enhanced acceleration sound
• More emotional driving experience

This dual-character system ensures the CLS 450 remains a true luxury grand tourer when needed and a more engaging performance sedan when desired.

Premium Construction & Materials

Every Yonristic exhaust system is built using motorsport-grade materials and precision manufacturing processes.

Material Options

AISI 304 Stainless Steel

• High durability and corrosion resistance
• Long-term structural integrity
• Approximately 20% weight reduction vs OEM

Ti-6Al-4V Grade 5 Titanium (Optional)

• Up to 65% weight reduction
• Faster thermal dissipation
• Sharper, more responsive exhaust tone
• Ideal for performance-focused builds

All systems are finished using Yonristic’s signature polished-and-frosted surface treatment for a premium aesthetic.

Precision Engineering & Fitment

The CLS 450 exhaust system is designed for OEM-level fitment and reliability, ensuring seamless installation without modification.

Engineering Features

• True 3-inch mandrel-bent piping
• High-flow optimized exhaust routing
• Precision TIG-welded construction
• CNC-machined mounting components
• Factory mounting point compatibility
• Slip-free bolt-on design

Each system is engineered to deliver consistent performance while maintaining long-term durability under real-world driving conditions.

Direct Bolt-On Installation

Designed specifically for the Mercedes-Benz C257 platform, the system installs cleanly using factory mounting points.

Installation Features

• 100% bolt-on design
• No cutting required
• No welding required
• Factory hanger compatibility
• OEM-style installation process
• Slip-free sealed connections

This ensures a straightforward installation while maintaining factory-level reliability and serviceability.

Why Choose the Yonristic CLS 450 Exhaust?

The Yonristic Performance Exhaust is designed for owners who want more than just sound—it delivers a complete transformation in driving feel and refinement.

Key Highlights

• True 3-inch high-flow cat-back system
• Optimized for CLS 450 EQ Boost engine
• Factory valve integration
• Optional remote valve control
• Improved throttle response
• Enhanced turbo efficiency
• Deep, refined luxury performance sound
• Premium stainless steel or titanium construction
• OEM-quality bolt-on installation
• Designed and manufactured in-house by Yonristic Performance

This system enhances the CLS 450’s personality without compromising its luxury DNA.

Key Specifications

Configuration

• Performance cat-back exhaust system
• 3-inch mandrel-bent high-flow architecture
• Optimized muffler tuning for luxury performance balance

Valve Control

• OEM factory valve compatibility
• Optional remote valve control system
• Dual-mode sound operation

Materials

• AISI 304 Stainless Steel
• Optional Ti-6Al-4V Grade 5 Titanium

Construction

• Hand TIG-welded assembly
• CNC-machined mounting hardware
• Polished & frosted finish
• High-temperature resistant design

Installation

• Direct bolt-on installation
• Factory mounting point compatibility
• No cutting or welding required

Vehicle Fitment

Mercedes-Benz CLS 450 C257 — 2018–Present

Engine: 2.0L Turbocharged Inline-4 + EQ Boost Hybrid System

Designed, engineered, and manufactured in-house by Yonristic Performance.