Audi Audi S4 2009-2016

Audi Audi S4 2009-2016 Exhaust Specifications

Detailed technical specifications and documentation for the 2009-2016 Audi S4 exhaust system. Learn about the components, installation, and maintenance of the exhaust system for the 3.0L TFSI V6 engine.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2009-2016 Audi S4, including key features, measurements, and technical details. This section provides detailed insights into the exhaust system's design, components, and performance specifications.

How to Use

Use the search function to locate specific exhaust specifications by entering keywords such as 'catalytic converter,' 'muffler,' or 'exhaust diameter.'

Navigate through the exhaust documentation sections using the table of contents or by scrolling through the major sections and subsections.

Key Specifications

Exhaust Diameter

2.5 inches (63.5 mm)

Catalytic Converter Lifespan

100,000 miles (160,934 km)

Sound Pressure Level

72 dB at 3,000 RPM

Maximum Exhaust Temperature

950°C (1742°F)

Exhaust System Weight

48.5 lbs (22 kg)

Available Specifications

Exhaust System Overview

This section covers the general structure and components of the Audi S4 exhaust system, including materials, layout, and key features.

Exhaust System Layout

Dual exhaust system with quad tailpipes
Stainless steel construction for durability
Integrated catalytic converters for emissions control
Dual mufflers for optimized sound dampening
Exhaust diameter: 2.5 inches (63.5 mm)

Materials and Construction

High-grade stainless steel for corrosion resistance
TIG-welded joints for superior strength
Heat-resistant coatings for thermal management
Lightweight design for improved performance
Weight: 48.5 lbs (22 kg)

Note: The stainless steel construction ensures longevity and resistance to harsh driving conditions.

Catalytic Converters

This section provides detailed information about the catalytic converters, including their design, efficiency, and specifications.

Catalytic Converter Design

Dual catalytic converters for each exhaust bank
Ceramic honeycomb substrate for high surface area
Platinum, palladium, and rhodium catalyst coating
Oxygen sensor integration for optimal efficiency
Operating temperature range: 400°C to 800°C (752°F to 1472°F)

Emissions Compliance

Complies with Euro 5 and EPA Tier 2 standards
Reduces CO emissions by up to 90%
Reduces NOx emissions by up to 95%
Designed for a lifespan of 100,000 miles (160,934 km)
Replacement interval: 10 years or 120,000 miles (193,121 km)

Note: Regular inspection of the catalytic converters is recommended to maintain emissions compliance.

Mufflers and Sound Dampening

This section details the mufflers and sound dampening technologies used in the Audi S4 exhaust system.

Muffler Design

Dual-chamber mufflers for balanced sound output
Perforated inner tubes for sound wave cancellation
Fiberglass insulation for noise reduction
Exhaust note tuned for sporty yet refined sound
Sound pressure level: 72 dB at 3,000 RPM

Valvetronic Exhaust System

Optional Valvetronic exhaust system available
Electronically controlled exhaust valves
Adjustable sound profiles (Comfort, Dynamic, Auto)
Valve diameter: 2.0 inches (50.8 mm)
Maximum flow rate: 450 CFM (cubic feet per minute)

Note: The Valvetronic system enhances the driving experience by allowing customizable exhaust sound.

Performance Specifications

This section outlines the performance-related specifications of the Audi S4 exhaust system.

Flow and Backpressure

Exhaust flow rate: 320 CFM (cubic feet per minute)
Backpressure: 1.2 psi at 6,000 RPM
Optimized for 3.0L TFSI V6 engine output
Supports up to 450 horsepower
Pressure drop across mufflers: 0.8 psi

Thermal Performance

Maximum exhaust gas temperature: 950°C (1742°F)
Heat shields integrated for underbody protection
Thermal expansion allowance: 0.5 inches (12.7 mm)
Cool-down time to ambient temperature: 45 minutes
Heat dissipation rate: 1,200 BTU/hr

Note: The exhaust system is designed to handle high thermal loads without compromising performance.

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Component Specifications

General Specifications

Material: Stainless Steel

System Type: Dual Exhaust

Configuration: Quad-Tip

Emission Compliance: Euro 5

Part Number: 8K0253600A

Exhaust Manifold

Material: Cast Iron

Bolt Torque: 25 Nm

Gasket Part Number: 06E253039A

Heat Shield Material: Aluminized Steel

Heat Shield Thickness: 1.5 mm

Catalytic Converter

Type: Three-Way Catalytic Converter

Material: Ceramic Substrate

Cell Density: 400 cells per square inch

Efficiency: 98%

Part Number: 8K0254600B

Temperature Range: 400°C to 800°C

Resonator

Material: Stainless Steel

Diameter: 76 mm

Length: 400 mm

Part Number: 8K0253600C

Mounting Type: Rubber Hangers

Muffler

Material: Stainless Steel

Diameter: 102 mm

Length: 600 mm

Part Number: 8K0253600D

Sound Level: 72 dB at 3000 RPM

Mounting Type: Rubber Hangers

Exhaust Pipes

Material: Stainless Steel

Diameter: 63.5 mm

Wall Thickness: 1.5 mm

Bend Radius: 150 mm

Part Number: 8K0253600E

Oxygen Sensors

Type: Wideband Lambda Sensor

Location

Pre-Catalytic Converter
Post-Catalytic Converter

Part Number

06E906262A
06E906262B

Operating Temperature: -40°C to 900°C

Response Time: 0.1 seconds

Exhaust Tips

Material: Polished Stainless Steel

Diameter: 90 mm

Length: 150 mm

Part Number: 8K0253600F

Finish: Chrome Plated

Mounting System

Hanger Material: Rubber

Hanger Quantity: 6

Bolt Torque: 22 Nm

Part Number: 8K0253600G

Vibration Damping: High

Operational Parameters

Max Exhaust Gas Temperature: 950°C

Max Back Pressure: 0.3 bar

Flow Rate: 450 CFM

Noise Level: 74 dB at full throttle

Diagnostic Specifications

Oxygen Sensor Voltage Range: 0.1V to 0.9V

Catalytic Converter Efficiency Threshold: 95%

Exhaust Leak Detection Method: Smoke Test

Back Pressure Test Limits: 0.1 bar to 0.3 bar

Service Information Service

Detailed service requirements and schedules for the exhaust system

30000

Inspect exhaust system for leaks
Check oxygen sensor operation
Inspect catalytic converter for damage

Replace oxygen sensors if voltage readings are out of range

60000

Inspect and replace exhaust hangers if necessary
Check exhaust system alignment
Inspect muffler and resonator for corrosion

Use only OEM parts for replacements

100000

Replace catalytic converter if efficiency is below 95%
Inspect and replace exhaust pipes if necessary
Perform full exhaust system diagnostic

Ensure all bolts are torqued to specification during reassembly

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the diameter of the exhaust pipes on the 2009-2016 Audi S4?

The 2009-2016 Audi S4 features dual exhaust pipes with a diameter of 2.25 inches (57 mm) for each pipe. This configuration is designed to optimize exhaust flow and maintain performance.

What type of catalytic converter is used in the Audi S4 exhaust system?

The Audi S4 is equipped with a high-flow, three-way catalytic converter that meets Euro 5 emissions standards. It is constructed with a ceramic monolith substrate and coated with precious metals (platinum, palladium, and rhodium) for efficient emissions control.

Can the stock exhaust system be upgraded for better performance?

Yes, the stock exhaust system can be upgraded with aftermarket performance exhausts, such as those from Milltek or AWE Tuning. These systems often feature larger diameter pipes, high-flow mufflers, and reduced backpressure, which can improve horsepower and torque by 5-10%.

What is the recommended service interval for the exhaust system?

Audi recommends inspecting the exhaust system every 15,000 miles (24,000 km) or annually, whichever comes first. Key components to check include the catalytic converter, muffler, exhaust hangers, and pipe connections for signs of wear, corrosion, or leaks.

What is the material used in the Audi S4 exhaust system?

The Audi S4 exhaust system is primarily constructed from stainless steel, which provides excellent resistance to corrosion and heat. The muffler and resonator are also lined with sound-dampening materials to reduce noise while maintaining performance.

Does the Audi S4 exhaust system include a valved exhaust option?

Yes, the Audi S4 with the optional Sport Differential package includes a valved exhaust system. This system allows drivers to adjust the exhaust note between a quieter mode for daily driving and a more aggressive tone for performance driving.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Audi S4 Exhaust System Technical Manual

Coming Soon

Official Audi technical documentation detailing the exhaust system components, specifications, and maintenance procedures.

Performance Exhaust Upgrade Guide

Coming Soon

A comprehensive guide to upgrading the Audi S4 exhaust system with aftermarket options, including installation tips and performance benefits.

Exhaust System Maintenance Checklist

Coming Soon

A detailed checklist for inspecting and maintaining the Audi S4 exhaust system to ensure optimal performance and longevity.

Audi S4 Exhaust Sound Comparison

Coming Soon

A video resource comparing the sound profiles of the stock exhaust versus aftermarket options for the Audi S4.

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