Yonristic Porsche Mercedes C300 w205 Performance Cat-Back Exhaust System

Yonristic Porsche Mercedes C300 w205 Performance Cat-Back Exhaust SystemTrue 3 inch architecture. Remote controlled valving. A complete transformation for the W205 C300. The factory exhaust on the W205 C300 is designed around refinement and compliance, leaving significant flow and character on the table. Our cat back system is engineered to unlock the cars hidden personality while maintaining everyday usability. We run a full 3. 0 inch mandrel bent main pipe from the front connection all the way through the system,

True 3-inch architecture. Remote-controlled valving. A complete transformation for the W205 C300.

The factory exhaust on the W205 C300 is designed around refinement and compliance, leaving significant flow and character on the table. Our cat-back system is engineered to unlock the car’s hidden personality while maintaining everyday usability. We run a full 3.0-inch mandrel-bent main pipe from the front connection all the way through the system, eliminating restrictive sections found in the OEM layout. The larger, constant-diameter flow path reduces backpressure, improves exhaust velocity, and allows the turbocharged four-cylinder to breathe freely, especially in the mid-range where the car spends most of its time.

At the rear, the system splits into a dual-exit configuration feeding electronically actuated mufflers, giving you full control over the exhaust character. With the valves closed, exhaust gases are routed through the internal chambers to keep volume restrained and cruising smooth. Open the valves and the flow path becomes significantly more direct, sharpening throttle response and delivering a deeper, more aggressive tone that finally matches the car’s performance potential. Valve operation is handled exclusively through the included wireless remote control, allowing instant switching between modes without relying on factory electronics.

Every component is built with precision and longevity in mind. The system is available in AISI 304 stainless steel for excellent corrosion resistance and daily durability, or Ti-6Al-4V Grade 5 titanium for drivers seeking maximum weight savings and a more vivid, motorsport-inspired acoustic character. All sections are hand TIG-welded, with smooth mandrel bends that preserve diameter through every curve for consistent flow and OEM-level fitment.

Visually, the system is finished with quad 4.5-inch tips, designed to properly fill the rear diffuser and give the W205 a wider, more performance-oriented stance. Tip finishes include chrome, burnt, black, or carbon fiber to match the vehicle’s aesthetic. Installation is fully bolt-on, utilizing factory mounting points with no cutting or welding required.

The result is a C300 that cruises quietly when needed, opens up instantly on demand, and delivers improved response, stronger mid-range pull, and a refined yet aggressive sound signature — all engineered as a complete system rather than just a louder exhaust.

Key Specifications

Fitment
Mercedes-Benz C300 (W205)
Model Years: 2015–2021
Body Styles: Sedan (W205) / Coupe (C205) / Cabriolet (A205)
Drivetrain: RWD / 4MATIC

Configuration
Cat-back exhaust system
True 3.0-inch mandrel-bent main piping for improved flow and reduced backpressure
Dual rear muffler layout with electronically actuated valves
Straight-through performance routing when valves are open

Valve Control
Wireless remote-controlled valve system (included)
On-demand valve open/close modes for quiet cruising or aggressive sound
Independent system — does not require factory valve electronics

Materials
AISI 304 Stainless Steel – corrosion resistant and daily-driver durable
Optional Ti-6Al-4V Grade 5 Titanium – significant weight savings + sharper acoustic character
Hand TIG-welded construction for strength, fitment accuracy, and clean finish

Performance Gains (realistic estimates for stock/tune-ready W205 C300)
Horsepower Increase: ~+8–14 HP
Torque Increase: ~+10–16 lb-ft
Faster spool response and improved mid-range pull, especially when paired with a tune/downpipe

Manufacturing & Fitment
Mandrel bending maintains constant diameter through every radius
CNC-cut flanges and brackets for OEM-style mounting and alignment
Designed to clear factory underbody bracing and suspension geometry

Installation
100% bolt-on using factory mounting points
No cutting or welding required
Remote valve module installs cleanly with included hardware