Audi Audi RS5 2017-present Exhaust System Bolt Torque Specifications & Gasket Sealing
Audi Audi RS5 2017-present

Audi Audi RS5 2017-present Exhaust System Bolt Torque Specifications

Detailed torque specifications for exhaust bolts on the 2017-Present Audi RS5 (B9) platform, including flange and mounting bolt torques.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Turbo Downpipe Connection

This section outlines the torque specifications for the bolts connecting the downpipe to the turbocharger outlet flange. These are critical for a leak-free seal at the hottest point in the exhaust system.

1

Downpipe to Turbo Flange Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on similar Audi models. Use a cross-tightening pattern to ensure even pressure. Always use new bolts and nuts, single use recommended.

Downpipe Midpipe Connection

This section covers the torque specifications for the flange bolts connecting the downpipe to the mid-pipe section of the exhaust system. Proper torque here is important for sealing exhaust gases and maintaining proper exhaust flow.

1

Downpipe to Mid-Pipe Flange Bolts

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on similar Audi models. Use a cross-tightening pattern to ensure even pressure. Always use new gaskets.

Midpipe Resonator Muffler Connection

This section includes the torque specifications for bolts connecting the mid-pipe to the resonator or muffler sections. This is an important joint for maintaining structural integrity and noise levels.

1

Mid-Pipe to Resonator/Muffler Flange Bolts

M10 x 1.5
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated value based on similar Audi models. Use a cross-tightening pattern to ensure even pressure. Always use new gaskets.

Resonator Muffler Clamp Connection

This section details the torque values for any exhaust clamps found between the resonator and muffler, if any. These clamps provide a slip-fit connection and must be properly torqued to prevent leaks.

1

Resonator/Muffler Exhaust Clamp

M8 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on industry standard for this size clamp. Tighten to spec, do not overtighten.

Exhaust Hanger Brackets

This section covers the torque specifications for the bolts securing the exhaust hanger brackets to both the vehicle's chassis and the exhaust components. These brackets support the weight of the exhaust system.

1

Exhaust Hanger Bracket Bolts (Body-Side)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar Audi models. Ensure bolts are correctly aligned before tightening.
2

Exhaust Hanger Bracket Bolts (Exhaust-Side)

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Estimated value based on similar Audi models. Ensure bolts are correctly aligned before tightening.

Muffler Tailpipe Connection

This section details the torque specifications for bolts securing the tailpipes to the mufflers.

1

Muffler to Tailpipe Flange Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on similar Audi models. Use a cross-tightening pattern to ensure even pressure. Always use new gaskets.

O2 Sensor Installation

This section provides the torque specifications for installing the oxygen sensors into the exhaust pipes or downpipes. Proper torque is essential to prevent leaks and damage to the sensor.

1

Lambda (O2) Sensor into Exhaust Pipe/Downpipe

M18 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Estimated value based on industry standard for this size sensor. Use a torque wrench to avoid damaging the sensor. Do NOT overtighten.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

Why is it important to use the correct torque specifications for exhaust bolts?

Using the correct torque specification for exhaust bolts is crucial for several reasons. Under-tightening can lead to exhaust leaks, which can reduce engine performance, increase noise, and potentially allow harmful gases into the cabin. Over-tightening can stretch or break the bolts, damage the threads in the manifold or exhaust components, and make future removal difficult. Proper torque ensures a secure and leak-free seal.

Q2

What happens if I over-torque an exhaust bolt?

Over-torquing exhaust bolts can cause several issues. The most common is stretching or shearing the bolt, which can compromise its integrity and clamping force. This can lead to leaks or even bolt failure. Additionally, over-tightening can deform the exhaust flange, potentially requiring replacement of the exhaust components.

Q3

Can I reuse exhaust bolts?

It is generally recommended to replace exhaust bolts when they are removed, especially if they are torque-to-yield or stretch bolts. These types of bolts are designed to stretch when torqued to the correct specification and should not be reused. Reusing these bolts can lead to inconsistent clamping force, causing leaks. Furthermore, high-temperature exposure can weaken bolts over time.

Q4

Should I use any thread lubricant or anti-seize on exhaust bolts?

Applying anti-seize compound to exhaust bolts is highly recommended. The high operating temperatures of the exhaust system can cause the bolts to corrode or seize, making future removal extremely difficult. Anti-seize compound helps to prevent this, allowing for easier and safer removal down the road. Be cautious not to apply too much, as excess can affect the torque reading.

Q5

How often should I check my exhaust bolt torques?

It's a good practice to check the torque on your exhaust bolts after any major work on the exhaust system, or even after a few hundred miles after installing new parts. You should also check them periodically, especially before or after track days or any high-stress driving conditions. The heat cycling in the exhaust system can potentially cause bolts to loosen over time.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Torque Wrench (1/2" Drive)

A precision torque wrench is essential for accurately tightening exhaust bolts to the manufacturer's specifications. 1/2" drive is recommended for the higher torque values.

  • Click-type mechanism for accurate torque setting
  • Wide torque range to cover all exhaust bolts
  • Durable construction for repeated use
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench is useful for accessing bolts in tighter areas or for lower torque specifications.

  • Click-type mechanism for accurate torque setting
  • Suitable for lower torque ranges
  • Compact size for tight spaces
Learn more

Socket Set (Metric)

A comprehensive metric socket set is required to fit the various sizes of exhaust bolts on the Audi RS5.

  • Variety of socket sizes to fit all exhaust bolts
  • Durable steel construction
  • Includes common sizes for exhaust work
Learn more

Extension Bars and Universal Joints

These tools help reach hard-to-access exhaust bolts and allow for better positioning of the torque wrench.

  • Various lengths to access recessed bolts
  • Universal joints allow for flexible angles
  • Durable for repeated use
Learn more
Service Procedures

Exhaust Manifold Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting the exhaust manifolds to the engine heads on a 2017-Present Audi RS5.

  • Ensure the engine is cool before beginning.
  • Clean the threads of all bolts and the corresponding holes in the manifold and cylinder head.
  • Install new gasket if necessary and position the exhaust manifold onto the cylinder head.
  • Install all manifold bolts by hand, tightening them finger tight initially.
  • Using a 3/8" drive torque wrench, tighten all bolts in a crisscross pattern to 12 Nm.
  • Continue tightening in the same crisscross pattern to 25 Nm.
  • Check each bolt to ensure proper torque.
  • Inspect for proper manifold to engine mating and verify no leaks are present.
View full procedure

Downpipe Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting the downpipes to the exhaust manifolds on a 2017-Present Audi RS5.

  • Ensure the engine and exhaust system are cool before beginning.
  • Clean the threads of all bolts and the corresponding holes.
  • Install new gaskets if necessary, and position the downpipe onto the manifold.
  • Install all downpipe bolts by hand, tightening them finger tight initially.
  • Using a 1/2" drive torque wrench, tighten the bolts in a crisscross pattern to 40 Nm.
  • Verify all bolts are tightened to the proper torque.
  • Inspect the connection for proper mating and verify no leaks are present
View full procedure

Exhaust System Flange Bolt Torque Procedure

This procedure outlines how to properly torque the bolts connecting sections of the exhaust system on a 2017-Present Audi RS5.

  • Ensure the exhaust system is cool before beginning.
  • Clean the threads of all bolts and the corresponding holes.
  • Position the exhaust sections together with a new gasket in place, if necessary
  • Install all flange bolts by hand, tightening them finger tight initially.
  • Using a 1/2" drive torque wrench, tighten the bolts to 30 Nm.
  • Verify all bolts are tightened to the proper torque.
  • Inspect the connection for proper mating and verify no leaks are present.
View full procedure
Technical Service Bulletins

Exhaust Manifold Bolt Loosening and Vibration

2020-05-15

Some 2017-2019 Audi RS5 models have reported exhaust manifold bolts loosening due to vibration, leading to exhaust leaks. This may be caused by improper torque application or bolt stretching.

2017-2019

Resolution: Inspect bolts and tighten to the specifications in the service procedures. It is recommended to use new bolts. Consider applying a thread locking compound to the bolt threads.

Downpipe Flange Bolt Corrosion and Stripping

2022-01-20

Corrosion of downpipe flange bolts and subsequent stripping during removal has been noted in some 2020-2022 Audi RS5 models. This is attributed to road salt and exposure.

2020-2022

Resolution: When replacing downpipes or working on the exhaust system, always use new, OE-quality bolts and nuts, if necessary. Apply anti-seize to the threads to prevent future issues. Ensure proper torque during installation.

Exhaust System Mounting Hardware Noise

2023-07-10

Some 2021-2023 Audi RS5 models have reported rattling or vibration noises from the exhaust system. This can be attributed to loose mounting bolts or damaged exhaust hangers.

2021-2023

Resolution: Inspect all exhaust system mounting hardware including bolts and hangers. Tighten mounting bolts to the specified torque. Replace any damaged hangers. Ensure the exhaust system is properly aligned.

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
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.

© 2025 Audi Specs. All rights reserved.

Privacy Policy Terms of Service