Audi Audi S8 1996-2011 Exhaust Specifications
Detailed technical specifications and documentation for the exhaust system of the 1996-2011 Audi S8. Includes information on components, materials, performance, and installation.
Overview Specifications
Comprehensive description of the exhaust specifications for the 1996-2011 Audi S8, including key features, measurements, and technical details. This section covers the exhaust system's design, materials, performance characteristics, and maintenance requirements.
How to Use
Use the search function to locate specific exhaust specifications by entering keywords such as 'catalytic converter,' 'muffler,' or 'exhaust pipe diameter.'
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Key Specifications
Exhaust Pipe Diameter
2.5 inches (63.5 mm)
Catalytic Converter Density
400 cpsi
Muffler Weight
12.5 kg (27.5 lbs)
Maximum Backpressure
1.2 psi (8.3 kPa)
Idle Sound Level
45 dB
Available Specifications
Exhaust System Design
Details about the overall design and layout of the exhaust system, including component placement and integration with the vehicle's chassis.
Exhaust System Design
Details about the overall design and layout of the exhaust system, including component placement and integration with the vehicle's chassis.
Exhaust Pipe Configuration
- Dual exhaust system with two separate pipes from the catalytic converter to the muffler
- Pipe diameter: 2.5 inches (63.5 mm)
- Stainless steel construction for durability and corrosion resistance
- Mandrel-bent pipes for optimal exhaust flow
- Integrated heat shields to protect surrounding components
Catalytic Converter
- High-flow catalytic converter for reduced backpressure
- Ceramic honeycomb substrate with a 400 cells per square inch (cpsi) density
- Oxygen sensor placement: pre- and post-catalytic converter
- Compliance with Euro 3 and Euro 4 emissions standards
- Operating temperature range: 400°C to 800°C (752°F to 1472°F)
Note: Ensure proper oxygen sensor function to maintain optimal catalytic converter efficiency.
Muffler and Resonator
Information about the muffler and resonator, including their roles in noise reduction and exhaust flow optimization.
Muffler and Resonator
Information about the muffler and resonator, including their roles in noise reduction and exhaust flow optimization.
Muffler Specifications
- Dual-chamber muffler design for effective noise cancellation
- Internal baffle system to reduce exhaust turbulence
- Material: Aluminized steel for heat resistance
- Weight: 12.5 kg (27.5 lbs)
- Inlet and outlet diameter: 2.5 inches (63.5 mm)
Resonator Function
- Helmholtz resonator to cancel specific exhaust frequencies
- Integrated into the mid-pipe section
- Material: Stainless steel with perforated inner tube
- Length: 300 mm (11.8 inches)
- Diameter: 2.5 inches (63.5 mm)
Note: The resonator is critical for reducing drone at specific RPM ranges.
Exhaust Performance
Technical details about the exhaust system's performance, including backpressure, flow rates, and sound levels.
Exhaust Performance
Technical details about the exhaust system's performance, including backpressure, flow rates, and sound levels.
Backpressure and Flow
- Maximum backpressure: 1.2 psi (8.3 kPa)
- Exhaust flow rate: 450 CFM (cubic feet per minute)
- Optimized for the 4.2L V8 engine's output
- Pressure drop across the catalytic converter: 0.5 psi (3.4 kPa)
- Designed to minimize power loss
Sound Characteristics
- Idle sound level: 45 dB
- Full throttle sound level: 85 dB
- Tuned for a sporty yet refined exhaust note
- Resonance frequency: 120 Hz
- Complies with EU noise regulations
Note: Sound levels measured at 1 meter from the exhaust tip.
Maintenance and Service
Guidelines for maintaining and servicing the exhaust system, including inspection intervals and replacement parts.
Maintenance and Service
Guidelines for maintaining and servicing the exhaust system, including inspection intervals and replacement parts.
Inspection Intervals
- Inspect exhaust system every 15,000 miles (24,000 km)
- Check for leaks, cracks, and corrosion
- Verify oxygen sensor functionality
- Inspect mounting brackets and hangers
- Ensure heat shields are secure and intact
Replacement Parts
- Catalytic converter replacement interval: 100,000 miles (160,000 km)
- Muffler lifespan: 10 years or 150,000 miles (240,000 km)
- Oxygen sensor replacement: Every 60,000 miles (96,000 km)
- Exhaust gasket replacement during major service
- Use only OEM or equivalent parts for optimal performance
Note: Regular maintenance ensures compliance with emissions standards and prevents performance degradation.
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Component Specifications
General Specifications
- Material
- Stainless steel
- System Type
- Dual exhaust with quad tips
- Emission Compliance
- Euro 3 / Euro 4
- Part Number
- 4D0253600A
- Weight
- 28.5 kg
Exhaust Manifold
- Material
- Cast iron
- Bolt Torque
- 25 Nm + 90°
- Gasket Part Number
- 077198121A
- Heat Shield Material
- Aluminized steel
- Heat Shield Thickness
- 1.5 mm
Catalytic Converter
- Type
- Three-way catalytic converter
- Part Number
- 4D0254600B
- Efficiency
- >95%
- Operating Temperature
- 400-800°C
- Replacement interval
- 160,000 km
Resonator
- Material
- Stainless steel
- Part Number
- 4D0252600C
- Diameter
- 70 mm
- Length
- 450 mm
- Function
- Reduces exhaust noise and drone
Muffler
- Material
- Stainless steel
- Part Number
- 4D0253600D
- Diameter
- 90 mm
- Length
- 600 mm
- Sound Level
- 72 dB at 3000 RPM
Exhaust Pipes
- Material
- Stainless steel
- Diameter
- 70 mm
- Wall Thickness
- 1.5 mm
- Flex Pipe Part Number
- 4D0254600E
- Flex Pipe Length
- 200 mm
Oxygen Sensors
- Type
- Wideband lambda sensor
- Part Number
- 06A906262L
- Location
- Pre-catalytic and post-catalytic
- Operating Temperature
- -40°C to 900°C
- Replacement interval
- 100,000 km
Exhaust Tips
- Material
- Chrome-plated stainless steel
- Diameter
- 90 mm
- Length
- 150 mm
- Part Number
- 4D0253600F
- Finish
- Polished
Mounting System
- Rubber Mounts Part Number
- 4D0253600G
- Mount Bolt Torque
- 22 Nm
- Hanger Material
- Reinforced rubber
- Hanger Life Expectancy
- 10 years or 200,000 km
Performance Parameters
- Back Pressure
- <0.5 bar at 6000 RPM
- Exhaust Flow Rate
- 450 CFM
- Max Temperature
- 900°C
- Warranty
- 2 years or 60,000 km
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks
- Check oxygen sensor operation
- Inspect catalytic converter for damage
Replace oxygen sensors if fault codes are present
- Inspect and tighten all exhaust clamps
- Check rubber mounts for wear
- Inspect heat shields for corrosion
Replace rubber mounts if cracked or deteriorated
- Replace oxygen sensors
- Inspect catalytic converter efficiency
- Check exhaust system alignment
Perform emission system diagnostic scan
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the exhaust system configuration for the 1996-2011 Audi S8?
What is the exhaust system configuration for the 1996-2011 Audi S8?
The 1996-2011 Audi S8 features a dual exhaust system with two tailpipes, each measuring 2.5 inches in diameter. The system includes a catalytic converter, resonator, and muffler, designed to optimize exhaust flow and reduce backpressure for the 4.2L V8 engine.
Q2 What material is used in the Audi S8 exhaust system?
What material is used in the Audi S8 exhaust system?
The exhaust system is constructed from high-grade stainless steel, providing durability and resistance to corrosion. The muffler and resonator are lined with heat-resistant materials to withstand high temperatures and reduce noise levels.
Q3 What is the recommended service interval for the exhaust system?
What is the recommended service interval for the exhaust system?
Audi recommends inspecting the exhaust system every 15,000 miles or annually, whichever comes first. Key components such as the catalytic converter, hangers, and gaskets should be checked for wear, leaks, or damage. Replace worn parts immediately to prevent performance issues.
Q4 Can I install an aftermarket exhaust system on my Audi S8?
Can I install an aftermarket exhaust system on my Audi S8?
While aftermarket exhaust systems are available, Audi strongly recommends using genuine OEM parts to maintain performance, emissions compliance, and warranty coverage. Aftermarket systems may alter exhaust flow, trigger check engine lights, or void the vehicle's warranty.
Q5 What are the torque specifications for exhaust manifold bolts?
What are the torque specifications for exhaust manifold bolts?
The exhaust manifold bolts on the 4.2L V8 engine should be torqued to 22 Nm (16 lb-ft) in a crisscross pattern to ensure even pressure distribution. Always use new gaskets and bolts during reassembly to prevent leaks.
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 S8 Exhaust System Repair Manual
Coming SoonOfficial Audi repair manual detailing exhaust system removal, installation, and troubleshooting procedures for the 1996-2011 S8.
Exhaust System Maintenance Guide
Coming SoonComprehensive guide on maintaining and inspecting the exhaust system, including common issues and solutions.
Genuine Audi Parts Catalog
Coming SoonAccess the official Audi parts catalog to find genuine exhaust components for your 1996-2011 S8.
Audi S8 Technical Specifications
Coming SoonDetailed technical specifications for the 1996-2011 Audi S8, including exhaust system dimensions and materials.
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