OAO High Performance Downpipes for Audi B9 S4 / S5 3.0T TFSI EA839 Twin-Turbo V6 T304 Stainless Steel Exhaust System

Unlock the Hidden Performance of Audi's EA839 3.0T Engine

Designed specifically for the Audi B9 S4 and S5 equipped with the advanced EA839 3.0L turbocharged V6 engine, the OAO High Performance Downpipes are engineered to improve exhaust flow, reduce turbocharger backpressure, and unlock the true performance potential of Audi's premium sport sedan and coupe platform.

Replacing the restrictive factory catalytic downpipes allows exhaust gases to exit the turbocharger more efficiently, improving turbo response, enhancing throttle sensitivity, increasing engine efficiency, and delivering a deeper, more aggressive exhaust note.

Manufactured from premium T304 stainless steel with precision TIG welding, CNC-machined flanges, and mandrel-bent tubing, every OAO downpipe is designed for maximum durability, excellent heat resistance, and OEM-quality fitment.

Key Features

✓ Designed for Audi B9 S4 / S5

✓ EA839 3.0L Turbocharged V6 TFSI Engine

✓ High-Flow Performance Downpipes

✓ Premium T304 Stainless Steel Construction

✓ Available in Catless or High-Flow Sport Catalytic Versions

✓ Precision TIG Welded

✓ Mandrel-Bent Tubing Design

✓ CNC Precision-Machined Flanges

✓ Reduced Exhaust Backpressure

✓ Faster Turbocharger Response

✓ Improved Exhaust Flow Efficiency

✓ OEM-Level Direct Bolt-On Fitment

Why Upgrade Your Audi B9 Downpipes?

The factory catalytic downpipe is designed to meet emissions regulations and noise requirements, which limits exhaust flow directly after the turbocharger.

The OAO High Performance Downpipes optimize exhaust gas evacuation, allowing the EA839 3.0T V6 engine to breathe more freely and perform more efficiently.

Potential benefits may include:

• Faster Turbo Spool

• Reduced Exhaust Restriction

• Improved Turbocharger Efficiency

• Sharper Throttle Response

• Enhanced Mid-Range Torque

• Improved High-RPM Performance

• Increased Exhaust Flow Capacity

• Better Compatibility with ECU Performance Tuning

Actual performance improvements may vary depending on supporting modifications and engine calibration.

Motorsport-Inspired Engineering

Developed using advanced exhaust flow engineering and performance-focused design principles, every OAO downpipe is optimized for performance, reliability, and perfect vehicle integration.

Engineering highlights include:

• Large-Diameter High-Flow Tubing

• Smooth Exhaust Gas Transition

• Reduced Internal Turbulence

• Optimized Exhaust Velocity

• Improved Heat Resistance

• Lightweight Performance Construction

• Factory Exhaust Compatibility

Designed for both daily driving and high-performance applications.

Enhanced Audi V6 Turbo Sound

The Audi EA839 3.0T V6 engine delivers a smooth yet powerful performance character.

The OAO Performance Downpipes enhance the natural sound of the engine:

• Deeper Cold Start

• Stronger Turbocharger Sound

• Richer V6 Exhaust Tone

• Sharper Acceleration Acoustics

• Enhanced Overrun Sound (ECU Calibration Dependent)

• Increased Exhaust Volume

• More Aggressive Sport Character

When paired with an OAO Valvetronic Exhaust System, the B9 S4/S5 delivers a more exciting and emotional driving experience.

Premium T304 Stainless Steel Construction

Manufactured from motorsport-grade T304 stainless steel to provide exceptional durability and long-term reliability.

Advantages include:

• Excellent Corrosion Resistance

• Superior Heat Resistance

• High Structural Strength

• Long Service Life

• Precision CNC-Machined Flanges

• Fully TIG Welded Construction

Each OAO downpipe undergoes strict quality inspection before shipment to ensure precise fitment and premium craftsmanship.

Vehicle Fitment

Compatible with:

Audi S4 B9

• S4 Sedan (B9)

• S4 Avant (B9)

Audi S5 B9

• S5 Coupe (B9)

• S5 Sportback (B9)

• S5 Cabriolet (B9)

Engine Platform

• EA839 3.0L Turbocharged V6 TFSI

Model Years

• 2017

• 2018

• 2019

• 2020

• 2021

• 2022

• 2023

• 2024

Please verify your vehicle model, engine code, and factory exhaust configuration before ordering.

Package Includes

• OAO High Performance Downpipes

• Installation Hardware Kit

• Protective Packaging

Installation

Direct bolt-on installation using factory mounting locations.

No cutting or welding required.

Professional installation is highly recommended for proper fitment and performance.

ECU calibration is recommended after installation to maximize performance and optimize engine operation.

Important Notes

Available in:

• Catless Version

• High-Flow Sport Catalytic Version

This product is intended for off-road or motorsport use where permitted by local regulations.

Please verify local emissions requirements before purchasing or installing this product.

Why Choose OAO Performance

OAO specializes in premium exhaust systems for Audi, BMW M, Mercedes-AMG, Porsche, Ferrari, Lamborghini, Aston Martin, Nissan GT-R, and other world-class performance vehicles.

Every OAO exhaust component combines precision engineering, premium materials, and extensive vehicle testing to deliver OEM-quality fitment, exceptional durability, and outstanding performance.

Upgrade your Audi B9 S4 or S5 3.0T with the OAO High Performance Downpipes and experience faster turbo response, improved exhaust flow, and the enhanced performance character of Audi's EA839 turbocharged V6 engine.