Audi Audi S6 1999-2004

Audi Audi S6 1999-2004 Exhaust Specifications

Detailed technical specifications and documentation for the 1999-2004 Audi S6 exhaust system, including OEM parts, torque values, and installation guidelines. Ideal for technicians and enthusiasts.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 1999-2004 Audi S6, including key features, measurements, and technical details. This section provides detailed insights into the exhaust system's design, components, and performance characteristics.

How to Use

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

Navigate through the documentation sections using the table of contents or by scrolling through the major sections. Each section is labeled with a clear title and includes subsections for detailed information.

Key Specifications

Exhaust Pipe Diameter

2.25 inches (57 mm)

Catalytic Converter Diameter

4.5 inches (114 mm)

Muffler Weight

15 lbs (6.8 kg)

Exhaust Backpressure

1.5 psi at 3000 RPM

Sound Level at Full Throttle

85 dB

Available Specifications

Exhaust System Overview

This section provides an overview of the Audi S6's exhaust system, including its layout, materials, and key components.

System Layout

Dual exhaust system with two separate pipes from the catalytic converter to the rear mufflers
Stainless steel construction for durability and corrosion resistance
Total system length: 3.2 meters (10.5 feet)
Includes two catalytic converters, one per exhaust bank
Rear mufflers feature a dual-tip design for enhanced aesthetics

Materials and Construction

Primary pipes: 2.25 inches (57 mm) in diameter
Mufflers and catalytic converters made from high-grade stainless steel
Exhaust hangers constructed from reinforced rubber for vibration dampening
Heat shields made from aluminized steel for thermal protection

Note: The stainless steel construction ensures longevity and resistance to rust, even in harsh weather conditions.

Catalytic Converters

This section details the specifications and performance of the catalytic converters used in the Audi S6's exhaust system.

Design and Function

Two catalytic converters, one for each exhaust bank
Ceramic honeycomb substrate with a platinum-rhodium-palladium coating
Efficiency: 98% reduction in harmful emissions
Operating temperature range: 400°C to 800°C (752°F to 1472°F)
OBD-II compliant for emissions monitoring

Technical Specifications

Diameter: 4.5 inches (114 mm)
Length: 12 inches (305 mm)
Weight: 8.5 lbs (3.85 kg) per converter
Flow rate: 250 CFM (cubic feet per minute) at 3000 RPM

Note: The catalytic converters are designed to meet strict Euro 3 emissions standards.

Mufflers and Resonators

This section covers the design, materials, and performance of the mufflers and resonators in the Audi S6's exhaust system.

Muffler Design

Dual-chamber design for optimal noise reduction
Stainless steel construction with a polished finish
Dimensions: 24 inches (610 mm) long, 8 inches (203 mm) wide, 6 inches (152 mm) tall
Weight: 15 lbs (6.8 kg) per muffler
Dual exhaust tips with a 3.5-inch (89 mm) diameter

Resonator Specifications

Located between the catalytic converter and the muffler
Length: 18 inches (457 mm)
Diameter: 3 inches (76 mm)
Material: Aluminized steel with internal baffles
Reduces drone and high-frequency noise

Note: The resonators are tuned to minimize exhaust drone while maintaining a sporty exhaust note.

Exhaust Performance

This section provides performance metrics and technical details related to the Audi S6's exhaust system.

Flow and Backpressure

Maximum flow rate: 500 CFM (cubic feet per minute) at 6000 RPM
Backpressure: 1.5 psi at 3000 RPM
Optimized for the 4.2L V8 engine's output of 340 horsepower
Exhaust gas velocity: 120 ft/s (36.5 m/s) at peak RPM

Sound Characteristics

Idle sound level: 45 dB
Full throttle sound level: 85 dB
Deep, resonant tone with minimal drone
Tuned for a balance between performance and comfort

Note: The exhaust system is engineered to provide a sporty yet refined sound profile.

Search Specifications

Search by specification name, value, or description

Component Specifications

General Specifications

System Type: Dual exhaust with rear mufflers

Material: Stainless steel

Configuration: Split rear exhaust with dual tailpipes

Emission Compliance: EURO 3

Part Number: 4B0253609A

Exhaust Manifold

Material: Cast iron

Bolt Torque: 25 Nm

Gasket Part Number: 078129717D

Heat Shield Material: Aluminized steel

Heat Shield Part Number: 4B0253117A

Catalytic Converter

Type: Two-way catalytic converter

Location: Integrated into downpipe

Part Number: 4B0254105B

Efficiency: >95%

Operating Temperature: 400-800°C

Replacement interval: 120,000 miles

Downpipe

Material: Stainless steel

Diameter: 60 mm

Length: 1200 mm

Flex Pipe included: true

Flex Pipe Part Number: 4B0253115C

Resonator

Type: Center-mounted resonator

Material: Stainless steel

Diameter: 70 mm

Length: 500 mm

Part Number: 4B0253110D

Mufflers

Type: Dual rear mufflers

Material: Stainless steel

Diameter: 90 mm

Length: 800 mm

Part Number: 4B0253609A

Sound Level: 72 dB at 3000 RPM

Tailpipes

Material: Polished stainless steel

Diameter: 80 mm

Length: 300 mm

Finish: Chrome-plated

Part Number: 4B0253112E

Mounting System

Hanger Material: Rubber with steel reinforcement

Hanger Part Number: 4B0253114F

Bolt Torque: 22 Nm

Bracket Material: Galvanized steel

Bracket Part Number: 4B0253116G

Operational Parameters

Max Exhaust Gas Temperature: 950°C

Back Pressure Limit: 0.5 bar

Flow Rate: 450 CFM

Warranty Coverage: 8 years or 80,000 miles

Diagnostic Specifications

OBD2 Monitoring: Catalyst efficiency, oxygen sensors

Fault Codes

P0420
P0430
P0135

inspection Interval: Every 30,000 miles

Diagnostic Tool: VAG-COM or equivalent

Service Information Service

Detailed service requirements and schedules for the exhaust system

30,000

Inspect exhaust system for leaks
Check mounting hardware for tightness
Inspect catalytic converter for damage

Replace gaskets if any leaks are detected

60,000

Inspect and clean oxygen sensors
Check resonator and muffler for corrosion
Verify exhaust back pressure

Use OEM parts for replacements

120,000

Replace catalytic converter if efficiency is below 90%
Inspect and replace flex pipe if necessary
Check heat shields for integrity

Follow manufacturer torque specifications during reassembly

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the diameter of the exhaust pipes on the 1999-2004 Audi S6?

The 1999-2004 Audi S6 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 engine performance.

What type of catalytic converter is used in the 1999-2004 Audi S6?

The 1999-2004 Audi S6 is equipped with a high-flow, dual-bed catalytic converter. It is designed to meet stringent emissions standards while minimizing backpressure. The catalytic converter is integrated into the exhaust manifold for efficient operation.

What material is the exhaust system made of on the 1999-2004 Audi S6?

The exhaust system on the 1999-2004 Audi S6 is constructed from stainless steel, which provides excellent corrosion resistance and durability. The muffler and resonator are also made of stainless steel to ensure long-term performance.

What is the recommended service interval for the exhaust system on the 1999-2004 Audi S6?

Audi recommends inspecting the exhaust system every 15,000 miles or annually, whichever comes first. This includes checking for leaks, corrosion, and damage to the pipes, muffler, and catalytic converter. Replacement of worn components should be done as needed.

Can aftermarket exhaust systems be installed on the 1999-2004 Audi S6?

Yes, aftermarket exhaust systems can be installed, but it is crucial to ensure compatibility with the vehicle's engine management system. Non-compliant systems may trigger check engine lights or affect emissions performance. Always consult with a professional before installation.

What is the backpressure specification for the 1999-2004 Audi S6 exhaust system?

The backpressure specification for the 1999-2004 Audi S6 exhaust system should not exceed 1.5 psi (10.3 kPa) at idle and 3.0 psi (20.7 kPa) at 3,000 RPM. Excessive backpressure can indicate a blockage or restriction in the system.

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 S6 Exhaust System Service Manual

Coming Soon

Official service manual for the 1999-2004 Audi S6 exhaust system, including detailed diagrams, torque specifications, and installation procedures.

Audi Genuine Parts Catalog

Coming Soon

Catalog of genuine Audi exhaust components for the 1999-2004 S6, ensuring proper fitment and performance.

Exhaust System Maintenance Guide

Coming Soon

Comprehensive guide on maintaining and troubleshooting the exhaust system for the 1999-2004 Audi S6, including common issues and solutions.

Emissions Compliance Information

Coming Soon

Detailed information on emissions standards and compliance for the 1999-2004 Audi S6 exhaust system, including catalytic converter requirements.

About the Author

Expert automotive knowledge and experience

ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact

15+ Years

Experience

500+ Guides

Guides

50+ Makes

Vehicles

1000+ Solutions

Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

ASE Master Technician Certification
Advanced Diagnostic Specialist
Hybrid/Electric Vehicle Systems
Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information

The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.

Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information

All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
Vehicle specifications and procedures may vary by model year, trim level, and region.
Always follow the manufacturer's recommended procedures and safety precautions.
Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
If you're unsure about any procedure, consult a qualified professional mechanic.

Intellectual Property

All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.