Audi TTRS (Mk3) Valved Cat-Back Exhaust System

3" T304 Stainless Steel with OEM-Style Electronic Valve Control

Overview

The five-cylinder soundtrack is iconic-the factory cat-back just keeps it on too short a leash. The Valvetronic Designs Valved Cat-Back for the Mk3 TTRS increases system diameter to 3 inches for significantly improved flow and a sharper, more characterful note without sacrificing daily comfort.

At the heart of the design is our rear Y-section: straight-through when valves are open for maximum presence, and routed through a quad-chamber center muffler when closed for quiet, refined cruising. The dream exhaust for Audi’s modern 5-cylinder is here.

Why It Works

• 3" Free-Flow Architecture: Reduces back pressure and unlocks response through the rev range.

• Dual-Path Rear Y-Section: Straight-through (open) or muffled (closed) for two distinct personalities.

• System Tuning as a Whole: Designed as a cohesive cat-back for consistent tone and perfect fit.

Sound & Control

• Valves Open: Uninterrupted flow to the tips-crisp, aggressive 5-cylinder character.

• Valves Closed: Gas passes through the quad-chamber center muffler-significantly reduced volume, highway-friendly.

• OEM Integration: Uses OEM-style electronically actuated valves; compatible with OEM Audi valve control.

Construction & Quality

• Material: T304 stainless steel throughout.

• Craftsmanship: Precision TIG welds and fully mandrel-bent tubing.

• Weight Savings: 14.8 lb lighter than the factory exhaust.

• Finish & Tips: Premium tips engineered to complement the TTRS rear bumper.

Fitment

• 2017–2020 Audi TTRS (Mk3 / 8S)

Installation Notes

• Direct bolt-on cat-back; no permanent modifications required.

• 100% reversible-return to stock at any time.

What’s Included

• 3" T304 stainless steel valved cat-back system

• Quad-chamber center muffler

• OEM-style electronic valves

• All required clamps and hardware

Specifications

• Tubing Diameter: 3" from front to rear

• Material: T304 stainless steel

• Valves: OEM-style electronic actuation (compatible with OEM control)

• Weight Savings: 14.8 lb vs. OEM

• Design: Dual-path rear Y-section; quad-chamber muffler (valves closed)