BMW M3 2015-2020 Exhaust Specifications
Detailed technical specifications and documentation for the 2015-2020 BMW M3 exhaust system, including components, materials, dimensions, and performance data. Ideal for technicians, enthusiasts, and repair professionals.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2015-2020 BMW M3, including key features, measurements, and technical details. This section covers the exhaust system's design, materials, performance characteristics, and maintenance requirements.
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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
70 mm (2.75 in)
Maximum Flow Rate
450 CFM
Backpressure
0.8 psi
Sound Level Range
85 dB to 105 dB
Weight Savings (Titanium)
5 kg (11 lbs)
Available Specifications
Exhaust System Design
This section details the design and layout of the 2015-2020 BMW M3 exhaust system, including its components and their arrangement.
Exhaust System Design
This section details the design and layout of the 2015-2020 BMW M3 exhaust system, including its components and their arrangement.
Exhaust Layout
- Dual exhaust system with quad tailpipes
- Stainless steel construction for durability and corrosion resistance
- Optimized flow path for reduced backpressure
- Exhaust diameter: 70 mm (2.75 in)
- Valvetronic exhaust system for adjustable sound levels
Exhaust Materials
- Primary material: T304 stainless steel
- Heat-resistant ceramic coating on muffler and pipes
- Lightweight titanium optional for M Performance exhaust
- Weight savings: ~5 kg (11 lbs) with titanium option
Note: The titanium exhaust option is available as part of the M Performance package.
Performance Specifications
This section covers the performance-related specifications of the exhaust system, including flow rates, backpressure, and sound levels.
Performance Specifications
This section covers the performance-related specifications of the exhaust system, including flow rates, backpressure, and sound levels.
Flow and Backpressure
- Maximum exhaust flow rate: 450 CFM (cubic feet per minute)
- Backpressure at full load: 0.8 psi
- Optimized for high-revving S55 engine performance
- Catalytic converter efficiency: 98%
Sound Characteristics
- Adjustable exhaust sound via Valvetronic system
- Sound level range: 85 dB to 105 dB
- Active sound tuning for sport and comfort modes
- M Performance exhaust adds a deeper, more aggressive tone
Maintenance and Service
This section provides details on maintaining and servicing the exhaust system, including inspection intervals and common issues.
Maintenance and Service
This section provides details on maintaining and servicing the exhaust system, including inspection intervals and common issues.
Inspection and Cleaning
- Inspect exhaust system every 15,000 miles (24,000 km)
- Check for leaks, cracks, and corrosion
- Clean exhaust tips with non-abrasive cleaner
- Inspect mounting brackets and hangers for wear
Common Issues
- Potential for rattling due to loose heat shields
- Corrosion in high-salt environments
- Valvetronic actuator failure in rare cases
- Excessive soot buildup on tailpipes
Note: Regular cleaning and inspection can prevent most common issues.
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Component Specifications
General Specifications
- Material
- Stainless steel
- System Type
- Dual exhaust with quad tailpipes
- Configuration
- Twin-pipe design with cross-over
- Emission Compliance
- Euro 6 and EPA Tier 3
- Weight
- 22.5 kg
Exhaust Manifold
- Material
- Cast iron
- Part Number
- 11627848451
- Bolt Torque
- 25 Nm + 90°
- Gasket Material
- Graphite
- Heat Shield Material
- Aluminum
Catalytic Converters
- Type
- Two-way catalytic converter
- Part Number
- 18307849432
- Substrate Material
- Ceramic
- Precious Metals
-
- Platinum
- Palladium
- Operating Temperature
- 400°C to 800°C
- Efficiency
- >95%
Mid Pipe
- Material
- Stainless steel
- Diameter
- 70 mm
- Part Number
- 18307849433
- Resonator included
- true
- Resonator Type
- Helmholtz resonator
Muffler
- Material
- Stainless steel
- Part Number
- 18307849434
- Design
- Perforated tube with sound-absorbing material
- Noise Reduction
- 15 dB
- Tailpipe Diameter
- 80 mm
Exhaust Valve System
- Type
- Electronically controlled valve
- Part Number
- 18307849435
- Actuation Type
- Electric motor
- Valve Diameter
- 60 mm
- Operating Pressure
- 0.5 bar
- Control Module
- Integrated with ECU
Mounting System
- Hanger Material
- Rubber with steel reinforcement
- Hanger Part Number
- 18307849436
- Bolt Torque
- 40 Nm
- Vibration Damping
- High-frequency damping
- Alignment Tolerance
- ±2 mm
Thermal Management
- Heat Shield Material
- Aluminum with ceramic coating
- Heat Shield Part Number
- 18307849437
- Thermal insulation Thickness
- 5 mm
- Max Surface Temperature
- 120°C
- Heat Reflectivity
- 85%
Diagnostic Specifications
- Oxygen Sensor Type
- Wideband lambda sensor
- Sensor Part Number
- 18307849438
- Sensor Location
-
- Pre-catalytic converter
- Post-catalytic converter
- Sensor Operating Temperature
- -40°C to 900°C
- Sensor Response Time
- <100 ms
Maintenance Specifications
- inspection Interval
- Every 30,000 miles or 24 months
- Torque Check interval
- Every 60,000 miles or 48 months
- Gasket Replacement interval
- Every 100,000 miles or 84 months
- Cleaning Procedure
- Use non-abrasive cleaner for stainless steel surfaces
- Safety Precautions
- Allow exhaust system to cool before servicing
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks
- Check mounting hardware for tightness
- Inspect oxygen sensors for proper operation
Use BMW-approved diagnostic tools for sensor checks
- Torque check all exhaust system bolts
- Inspect catalytic converter for damage
- Check exhaust valve operation
Replace gaskets if any signs of leakage are detected
- Replace exhaust manifold gasket
- Inspect and clean oxygen sensors
- Check heat shields for integrity
Use OEM parts for replacements to ensure proper fit and performance
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the diameter of the exhaust pipes on the 2015-2020 BMW M3?
What is the diameter of the exhaust pipes on the 2015-2020 BMW M3?
The 2015-2020 BMW M3 features a dual exhaust system with pipes measuring 80mm in diameter. This design optimizes exhaust flow and enhances performance.
Q2 What material is used for the exhaust system in the BMW M3?
What material is used for the exhaust system in the BMW M3?
The exhaust system is constructed from high-quality stainless steel, which provides durability, corrosion resistance, and improved thermal efficiency.
Q3 Does the BMW M3 exhaust system include a valve-controlled exhaust?
Does the BMW M3 exhaust system include a valve-controlled exhaust?
Yes, the BMW M3 is equipped with an electronically controlled exhaust flap system. This allows drivers to adjust the exhaust note and performance characteristics via the driving mode settings.
Q4 What is the backpressure specification for the BMW M3 exhaust system?
What is the backpressure specification for the BMW M3 exhaust system?
The backpressure is optimized to maintain a balance between performance and emissions compliance. The system is designed to operate within a range of 0.8 to 1.2 psi under normal driving conditions.
Q5 Can aftermarket exhaust systems void the BMW M3 warranty?
Can aftermarket exhaust systems void the BMW M3 warranty?
Installing an aftermarket exhaust system may void the warranty if it causes damage to the vehicle or related components. Always consult your BMW dealership or warranty documentation before making modifications.
Q6 What is the recommended service interval for the exhaust system?
What is the recommended service interval for the exhaust system?
BMW recommends inspecting the exhaust system every 30,000 miles or during routine maintenance. This includes checking for leaks, corrosion, and ensuring all components are securely fastened.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
BMW M3 Exhaust System Technical Guide
Coming SoonA detailed guide covering the design, specifications, and maintenance of the BMW M3 exhaust system.
BMW Genuine Parts Catalog
Coming SoonAccess the official BMW parts catalog to find genuine exhaust components for your 2015-2020 M3.
BMW M3 Service Manual
Coming SoonThe official service manual for the 2015-2020 BMW M3, including exhaust system repair and maintenance procedures.
BMW Warranty Information
Coming SoonLearn about the warranty coverage for your BMW M3 and how modifications may affect it.
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