BMW M4 2021-present Exhaust Specifications
Comprehensive technical documentation for the exhaust system of the 2021-Present BMW M4, including detailed specifications, component descriptions, and performance metrics.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2021-Present BMW M4, including key features, measurements, and technical details. This section provides detailed insights into the exhaust system's design, components, and performance characteristics.
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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
80 mm (3.15 in)
Maximum Flow Rate
450 CFM
Backpressure at Full Load
1.2 psi
Sound Pressure Level
95 dB
Catalytic Converter Efficiency
98%
Available Specifications
Exhaust System Overview
This section covers the general design and layout of the BMW M4's exhaust system, including its components and materials.
Exhaust System Overview
This section covers the general design and layout of the BMW M4's exhaust system, including its components and materials.
Exhaust System Layout
- Twin-pipe exhaust system with dual tailpipes
- Stainless steel construction for durability and corrosion resistance
- Integrated M Sport exhaust with valve control for adjustable sound
- Exhaust diameter: 80 mm (3.15 in) for each tailpipe
Materials and Construction
- High-grade stainless steel used for all exhaust components
- Ceramic-coated exhaust tips for heat resistance and aesthetics
- Lightweight design to reduce overall vehicle weight
- Welded seams for enhanced durability and leak prevention
Note: The ceramic coating on the exhaust tips can withstand temperatures up to 900°C (1652°F).
Exhaust Performance Specifications
This section details the performance-related specifications of the exhaust system, including flow rates, backpressure, and sound levels.
Exhaust Performance Specifications
This section details 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: 1.2 psi (pounds per square inch)
- Optimized exhaust scavenging for improved engine efficiency
- Valve-controlled exhaust for reduced backpressure at low RPM
Sound Characteristics
- Sound pressure level: 95 dB at full throttle
- Adjustable exhaust note via M Drive settings
- Active Sound Design for enhanced cabin acoustics
- Resonator-free design for a more aggressive exhaust tone
Note: The exhaust sound can be customized using the BMW M Drive Professional system.
Exhaust Emissions and Compliance
This section outlines the emissions standards and compliance features of the BMW M4's exhaust system.
Exhaust Emissions and Compliance
This section outlines the emissions standards and compliance features of the BMW M4's exhaust system.
Emissions Control
- Euro 6d-TEMP emissions standard compliance
- Dual catalytic converters for reduced NOx and CO emissions
- Particulate filter integrated into the exhaust system
- OBD-II compliant for emissions monitoring
Catalytic Converter Specifications
- Primary catalytic converter temperature range: 400°C to 800°C (752°F to 1472°F)
- Secondary catalytic converter efficiency: 98%
- Catalytic converter material: Ceramic substrate with platinum coating
- Replacement interval: 150,000 km (93,206 miles)
Note: The catalytic converters are designed to operate efficiently under high-performance conditions.
Maintenance and Service
This section provides information on maintaining and servicing the BMW M4's exhaust system.
Maintenance and Service
This section provides information on maintaining and servicing the BMW M4's exhaust system.
Routine Maintenance
- Inspect exhaust system every 10,000 km (6,214 miles)
- Check for leaks, cracks, or corrosion during service intervals
- Clean exhaust tips with non-abrasive cleaners
- Tighten exhaust clamps to 25 Nm (18.4 lb-ft) torque
Component Replacement
- Replace gaskets and seals every 50,000 km (31,069 miles)
- Exhaust valve actuator service interval: 100,000 km (62,137 miles)
- Use only OEM parts for replacements
- Follow torque specifications for all exhaust fasteners
Note: Improper installation of aftermarket parts may void the vehicle's warranty.
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Component Specifications
General Specifications
- System Type
- Twin-pipe exhaust system with dual tailpipes
- Material
- Stainless steel
- Finish
- Chrome-plated tailpipes
- Weight
- Approximately 22.5 kg (49.6 lbs)
- Compliance
- EU6d-TEMP emissions standard
Exhaust Manifold
- Material
- Cast iron
- Part Number
- 11627848472
- Bolt Torque
- 25 Nm (18.4 lb-ft)
- Gasket Material
- Graphite
- Heat Shield Material
- Aluminum
Catalytic Converters
- Type
- Two-stage catalytic converters
- Part Number
- 18307854321
- Substrate Material
- Ceramic
- Pre Cat Location
- Integrated into exhaust manifold
- Main Cat Location
- Underbody, near transmission
- Operating Temperature
- 400-800°C (752-1472°F)
Resonators
- Type
- Dual resonators
- Part Number
- 18307854322
- Material
- Stainless steel
- Diameter
- 80 mm (3.15 in)
- Length
- 450 mm (17.72 in)
- Function
- Reduces exhaust drone and noise
Mufflers
- Type
- Dual mufflers with valve control
- Part Number
- 18307854323
- Material
- Stainless steel
- Valve Actuation
- Electronically controlled
- Valve Part Number
- 18307854324
- Noise Level
- 74 dB(A) at idle, 92 dB(A) at full throttle
Tailpipes
- Type
- Dual chrome-plated tailpipes
- Part Number
- 18307854325
- Diameter
- 90 mm (3.54 in)
- Length
- 300 mm (11.81 in)
- Finish
- High-gloss chrome
Exhaust Valve Control
- Type
- Electronic exhaust flap control
- Part Number
- 18307854326
- Actuator Type
- Electric motor
- Control Unit
- Integrated into ECU
- Operating Range
- 0-100% open
- Response Time
- Less than 0.5 seconds
Mounting System
- Rubber Mounts
- Part Number: 18307854327Quantity: 4Material: Vulcanized rubberLoad Capacity: 15 kg (33 lbs) each
- Brackets
- Part Number: 18307854328Material: Stainless steelBolt Torque: 20 Nm (14.75 lb-ft)
Emissions System
- Oxygen Sensors
- Type: Wideband lambda sensorsPart Number: 18307854329Quantity: 2Location: Pre-cat and post-catOperating Temperature: Up to 930°C (1706°F)
- Particulate Filter
- Type: Gasoline particulate filter (GPF)Part Number: 18307854330Location: Integrated into main catalytic converterRegeneration Temperature: 600-650°C (1112-1202°F)
Performance Parameters
- Back Pressure
- Maximum 0.25 bar (3.63 psi)
- Exhaust Flow Rate
- Approximately 450 CFM at 6000 RPM
- Temperature Range
- Ambient to 950°C (1742°F)
- Warranty
- 2 years or 50,000 miles, whichever comes first
Exhaust System Service Information Service
Detailed service requirements and schedules for the BMW M4 exhaust system
- Inspect exhaust system for leaks and damage
- Check exhaust mounts and brackets for wear
- Verify proper operation of exhaust valves
Visual inspection and functional check required
- Replace oxygen sensors if necessary
- Inspect catalytic converters for clogging
- Check particulate filter for soot accumulation
Diagnostic scan tool required for sensor and filter checks
- Replace exhaust gaskets and seals
- Inspect and replace rubber mounts if worn
- Perform full exhaust system alignment check
Torque all bolts to manufacturer specifications
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What type of exhaust system does the 2021-Present BMW M4 use?
What type of exhaust system does the 2021-Present BMW M4 use?
The 2021-Present BMW M4 is equipped with a high-performance M Sport exhaust system, featuring a dual-branch setup with electronically controlled exhaust flaps. The system is constructed from lightweight stainless steel and includes quad tailpipes with a diameter of 100 mm each. The exhaust is designed to optimize backpressure and enhance engine sound, particularly in Sport and Sport+ modes.
Q2 What is the diameter of the exhaust pipes on the BMW M4?
What is the diameter of the exhaust pipes on the BMW M4?
The primary exhaust pipes on the BMW M4 have a diameter of 70 mm, while the quad tailpipes measure 100 mm in diameter. These dimensions are engineered to balance exhaust flow efficiency and acoustic performance.
Q3 Does the BMW M4 exhaust system include a particulate filter?
Does the BMW M4 exhaust system include a particulate filter?
Yes, the BMW M4 exhaust system includes a gasoline particulate filter (GPF) to comply with Euro 6d emissions standards. The GPF is integrated into the exhaust system and helps reduce particulate emissions without significantly impacting performance.
Q4 Can the exhaust flaps be manually controlled?
Can the exhaust flaps be manually controlled?
The exhaust flaps on the BMW M4 are electronically controlled and automatically adjust based on driving mode (Comfort, Sport, or Sport+). However, they can be manually overridden using the M Sound Control feature in the iDrive system or via aftermarket tuning solutions.
Q5 What is the weight of the BMW M4 exhaust system?
What is the weight of the BMW M4 exhaust system?
The standard M Sport exhaust system weighs approximately 22 kg (48.5 lbs). This lightweight design contributes to the vehicle's overall performance and handling characteristics.
Q6 Is the BMW M4 exhaust system compatible with aftermarket upgrades?
Is the BMW M4 exhaust system compatible with aftermarket upgrades?
Yes, the BMW M4 exhaust system is compatible with various aftermarket upgrades, including performance exhausts, downpipes, and mid-pipes. However, modifications may void the vehicle's warranty and should be performed by certified professionals to ensure proper fitment and compliance with emissions regulations.
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 M4 Exhaust System Technical Guide
Coming SoonA detailed guide covering the design, specifications, and maintenance of the BMW M4 exhaust system.
M Sound Control Setup Instructions
Coming SoonStep-by-step instructions for configuring the M Sound Control feature to customize exhaust sound profiles.
BMW Genuine Parts Catalog
Coming SoonAccess the official BMW parts catalog to find genuine exhaust components and accessories for the M4.
Exhaust System Maintenance Best Practices
Coming SoonLearn about recommended maintenance procedures to ensure the longevity and performance of your BMW M4 exhaust system.
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