Audi Audi S4 1997-2002 Exhaust Specifications
Detailed technical specifications and documentation for the 1997-2002 Audi S4 exhaust system, including OEM parts, torque values, material composition, and performance data.
Overview Specifications
Comprehensive description of the exhaust specifications for the 1997-2002 Audi S4, including key features, measurements, and technical details. This section provides detailed information on 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,' 'downpipe,' or 'muffler.'
Navigate through the exhaust documentation sections using the table of contents or by scrolling through the major sections and subsections.
Key Specifications
Pipe Diameter
2.5 inches (63.5 mm)
Backpressure
1.2 psi
Noise Level (Idle)
72 dB
Catalytic Converter Life
100,000 miles (160,000 km)
Total System Length
4.2 meters (13.8 feet)
Available Specifications
Exhaust System Overview
This section provides an overview of the Audi S4's exhaust system, including its layout, materials, and key components.
Exhaust System Overview
This section provides an overview of the Audi S4's exhaust system, including its layout, materials, and key components.
System Layout
- Dual exhaust system with two separate pipes from the downpipes to the mufflers
- Stainless steel construction for durability and corrosion resistance
- Integrated catalytic converters for emissions compliance
- Total system length: 4.2 meters (13.8 feet)
Key Components
- Two downpipes with integrated catalytic converters
- Two center resonators for noise reduction
- Dual rear mufflers with chrome-plated tips
- Exhaust hangers made of reinforced rubber for vibration dampening
Note: The catalytic converters are designed to meet Euro 3 emissions standards.
Exhaust Performance Specifications
This section details the performance-related specifications of the exhaust system, including flow rates, backpressure, and noise levels.
Exhaust Performance Specifications
This section details the performance-related specifications of the exhaust system, including flow rates, backpressure, and noise levels.
Flow and Backpressure
- Maximum exhaust flow rate: 450 CFM (cubic feet per minute)
- Backpressure at full load: 1.2 psi (pounds per square inch)
- Optimized pipe diameter: 2.5 inches (63.5 mm)
- Designed for minimal restriction to enhance engine performance
Noise Levels
- Idle noise level: 72 dB (decibels)
- Full throttle noise level: 92 dB
- Resonators reduce mid-frequency drone
- Mufflers designed for a sporty yet refined exhaust note
Note: Noise levels measured at 1 meter (3.3 feet) from the exhaust tips.
Exhaust Maintenance and Service
This section covers maintenance requirements, service intervals, and common issues related to the exhaust system.
Exhaust Maintenance and Service
This section covers maintenance requirements, service intervals, and common issues related to the exhaust system.
Maintenance Intervals
- Inspect exhaust system every 15,000 miles (24,000 km)
- Check for leaks, corrosion, and loose hangers
- Replace catalytic converters every 100,000 miles (160,000 km) or as needed
- Tighten exhaust clamps during routine service
Common Issues
- Corrosion at pipe joints and hangers
- Cracked or damaged catalytic converters
- Loose or broken exhaust hangers
- Excessive noise due to resonator or muffler failure
Note: Regular inspection can prevent costly repairs and ensure optimal performance.
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Component Specifications
General Specifications
- System Type
- Dual exhaust with dual catalytic converters
- Material
- Stainless steel
- Configuration
- Twin-pipe from turbochargers to rear mufflers
- Emission Standard
- EURO 3 compliant
- Part Number
- 8D0253600BX
Exhaust Manifold
- Material
- Cast iron
- Bolt Torque
- 25 Nm
- Gasket Part Number
- 058145757B
- Heat Shield Material
- Aluminized steel
- Heat Shield Thickness
- 1.5 mm
Turbo Downpipes
- Diameter
- 60 mm
- Material
- Stainless steel
- Flex Pipe Length
- 150 mm
- Flex Pipe Material
- Braided stainless steel
- Gasket Part Number
- 8D0252267A
Catalytic Converters
- Type
- Ceramic monolith
- Cell Density
- 400 cells per square inch
- Efficiency
- >95%
- Temperature Range
- 400-800°C
- Part Number
- 8D0254605A
Resonators
- Diameter
- 70 mm
- Material
- Stainless steel
- Length
- 400 mm
- internal Baffle Type
- Perforated tube with fiberglass packing
- Part Number
- 8D0252605C
Mufflers
- Diameter
- 90 mm
- Material
- Stainless steel
- Length
- 600 mm
- internal Baffle Type
- Chambered design
- Part Number
- 8D0252609D
Exhaust Tips
- Diameter
- 100 mm
- Material
- Polished stainless steel
- Length
- 150 mm
- Finish
- Chrome-plated
- Part Number
- 8D0252611E
Mounting Hardware
- Hanger Material
- Rubber with steel core
- Hanger Quantity
- 6
- Bolt Material
- Grade 8.8 steel
- Nut Material
- Self-locking stainless steel
- Torque Specifications
- Manifold Bolts: 25 NmDownpipe Bolts: 40 NmMuffler Bolts: 30 Nm
Operational Parameters
- Max Exhaust Gas Temperature
- 950°C
- Backpressure Limit
- 0.5 bar
- Idle Emission Levels
- CO: <0.5%HC: <100 ppmNOx: <200 ppm
Diagnostic Specifications
- OBD2 Monitoring
- Catalyst Monitor: EnabledOxygen Sensor Monitor: EnabledEvap System Monitor: Disabled
- Common Fault Codes
-
- P0420 - Catalyst System Efficiency Below Threshold
- P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
- P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
- Diagnostic Tools
-
- VAG-COM
- OBD2 scanner
- Exhaust gas analyzer
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks and damage
- Check catalytic converter efficiency
- Inspect oxygen sensors
- Tighten all exhaust mounting hardware
Replace gaskets if any leaks are detected
- Replace oxygen sensors
- Inspect and clean exhaust tips
- Check exhaust hangers for wear
- Perform emission system diagnostic
Use OEM parts for replacements to ensure compatibility
- Replace catalytic converters if efficiency is below 90%
- Inspect and replace flex pipes if necessary
- Check exhaust backpressure
- Perform full emission system diagnostic
Catalytic converter replacement may require reprogramming of the ECU
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the diameter of the exhaust piping on a 1997-2002 Audi S4?
What is the diameter of the exhaust piping on a 1997-2002 Audi S4?
The exhaust piping on the 1997-2002 Audi S4 has a diameter of 2.25 inches (57.15 mm) for the stock system. Aftermarket systems may vary, but this is the factory specification.
Q2 What type of catalytic converter is used in the 1997-2002 Audi S4 exhaust system?
What type of catalytic converter is used in the 1997-2002 Audi S4 exhaust system?
The 1997-2002 Audi S4 is equipped with a dual catalytic converter system, featuring two high-flow metallic substrate catalytic converters. These are designed to meet emissions standards while minimizing backpressure.
Q3 What is the recommended torque specification for exhaust manifold bolts?
What is the recommended torque specification for exhaust manifold bolts?
The exhaust manifold bolts on the 1997-2002 Audi S4 should be torqued to 22 Nm (16.2 ft-lbs) during installation. Always use new bolts and gaskets to ensure a proper seal and prevent leaks.
Q4 Can I install an aftermarket exhaust system without voiding my warranty?
Can I install an aftermarket exhaust system without voiding my warranty?
Installing an aftermarket exhaust system may void your warranty if it is determined that the modification caused damage to other components. Always consult your dealer or warranty documentation before making modifications.
Q5 What is the material composition of the stock exhaust system?
What is the material composition of the stock exhaust system?
The stock exhaust system on the 1997-2002 Audi S4 is made from stainless steel, which provides durability and resistance to corrosion. The mufflers and resonators are also constructed with stainless steel internals.
Q6 How often should the exhaust system be inspected for wear or damage?
How often should the exhaust system be inspected for wear or damage?
The exhaust system should be inspected every 15,000 miles or during routine maintenance. Look for signs of rust, cracks, or loose components, and address any issues promptly to prevent further damage.
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 Service Manual
Coming SoonOfficial Audi service manual detailing the removal, installation, and maintenance of the exhaust system for the 1997-2002 S4.
Exhaust System Torque Specifications Guide
Coming SoonComprehensive guide to torque specifications for all exhaust components, including manifolds, downpipes, and mufflers.
Audi S4 Emissions Compliance Documentation
Coming SoonDetailed information on the emissions standards and compliance of the 1997-2002 Audi S4 exhaust system.
Aftermarket Exhaust System Compatibility Guide
Coming SoonA guide to selecting and installing aftermarket exhaust systems for the 1997-2002 Audi S4, including performance and warranty considerations.
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