BMW M4 2014-2020 Exhaust Specifications
Detailed technical specifications and documentation for the 2014-2020 BMW M4 exhaust system. Learn about components, materials, performance, and maintenance for the BMW M4's high-performance exhaust.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2014-2020 BMW M4, including key features, measurements, and technical details. This section covers the design, materials, performance characteristics, and maintenance requirements of the exhaust system.
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Key Specifications
Exhaust Pipe Diameter
80 mm
Muffler Weight (Standard)
12.5 kg
Muffler Weight (Titanium)
7.5 kg
Exhaust Temperature (Max)
950°C
Sound Pressure Level (Max)
98 dB
Available Specifications
Exhaust System Design
This section provides an in-depth look at the design and layout of the BMW M4 exhaust system, including its components and their functions.
Exhaust System Design
This section provides an in-depth look at the design and layout of the BMW M4 exhaust system, including its components and their functions.
Exhaust Layout and Configuration
- Dual exhaust system with quad tailpipes
- Stainless steel construction for durability and corrosion resistance
- Optimized flow path for reduced backpressure
- Integrated valve-controlled exhaust flaps for adjustable sound and performance
Materials and Construction
- High-grade stainless steel used for all primary components
- Lightweight titanium muffler option available in Competition Package
- Ceramic-coated exhaust tips for heat resistance and aesthetics
- Precision-welded joints for leak-free performance
Note: The titanium muffler reduces weight by approximately 5 kg compared to the standard stainless steel version.
Performance Specifications
This section details the performance characteristics of the exhaust system, including flow rates, backpressure, and sound levels.
Performance Specifications
This section details the performance characteristics of the exhaust system, including flow rates, backpressure, and sound levels.
Flow and Backpressure
- Maximum exhaust flow rate: 650 CFM (cubic feet per minute)
- Backpressure at full load: 1.2 psi
- Optimized for high-revving S55 engine performance
- Valve-controlled flaps reduce backpressure by 15% in Sport mode
Sound and Acoustics
- Sound pressure level at idle: 72 dB
- Sound pressure level at full throttle: 98 dB
- Active Sound Design (ASD) enhances cabin acoustics
- Valve-controlled exhaust flaps allow for customizable sound profiles
Note: The Competition Package includes a more aggressive exhaust note with increased sound pressure levels.
Maintenance and Service
This section covers the maintenance requirements and service intervals for the BMW M4 exhaust system.
Maintenance and Service
This section covers the maintenance requirements and service intervals for the BMW M4 exhaust system.
Inspection and Cleaning
- Inspect exhaust system every 10,000 miles for leaks or damage
- Clean exhaust tips with non-abrasive cleaner to prevent discoloration
- Check valve-controlled flaps for proper operation during routine service
- Inspect mounting brackets and hangers for wear or corrosion
Replacement and Repair
- Replace catalytic converters every 100,000 miles or as needed
- Muffler replacement recommended if internal baffles are damaged
- Exhaust gaskets should be replaced during any disassembly
- Use only BMW-approved parts for repairs to maintain performance
Note: Aftermarket exhaust systems may void the vehicle's warranty.
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Component Specifications
General Specifications
- Material
- Stainless Steel
- System Type
- Dual Exhaust with M Performance Option
- Part Number
- 18307608810
- Weight
- 22.5 kg
- Compliance
- Euro 6 Emission Standards
Exhaust Manifold
- Material
- Cast Iron
- Part Number
- 11627848485
- Bolt Torque
- 25 Nm + 90°
- Gasket Part Number
- 11627848486
- Heat Shield Material
- Aluminum
Catalytic Converter
- Type
- Dual Catalytic Converters
- Part Number
- 18307608811
- Substrate Material
- Ceramic
- Cell Density
- 600 cells per square inch
- Operating Temperature
- 400°C to 800°C
- Efficiency
- >95%
Mid Pipe
- Material
- Stainless Steel
- Diameter
- 70 mm
- Part Number
- 18307608812
- Resonator included
- true
- Resonator Part Number
- 18307608813
Muffler
- Type
- Dual Mufflers with Valve Control
- Material
- Stainless Steel
- Part Number
- 18307608814
- Valve Actuation
- Electronically Controlled
- Sound Level
- 85 dB at 3000 RPM
- Weight
- 8.2 kg each
Exhaust Tips
- Material
- Chrome-Plated Stainless Steel
- Diameter
- 90 mm
- Part Number
- 18307608815
- Finish
- High-Gloss
- Adjustable
- true
Mounting And Hardware
- Hanger Material
- Rubber with Steel Core
- Hanger Part Number
- 18307608816
- Bolt Material
- High-Strength Steel
- Bolt Torque
- 40 Nm
- Gasket Part Number
- 18307608817
Performance Specifications
- Back Pressure
- 1.2 bar at 6000 RPM
- Flow Rate
- 450 CFM
- Power Gain
- 5-10 HP (with M Performance Exhaust)
- Torque Gain
- 5-8 Nm (with M Performance Exhaust)
Operational Limits
- Max Exhaust Gas Temperature
- 950°C
- Max System Pressure
- 2.5 bar
- Min Ambient Temperature
- -40°C
- Max Ambient Temperature
- 120°C
Diagnostic Specifications
- O2 Sensor Part Number
- 11787558025
- O2 Sensor Location
- Pre and Post Catalytic Converter
- Fault Codes
-
- P0420
- P0430
- P0135
- P0141
- Diagnostic Tool
- BMW ISTA
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks
- Check mounting hardware for tightness
- Inspect catalytic converter for damage
Replace gaskets if any leaks are detected
- Replace O2 sensors
- Inspect and clean exhaust tips
- Check valve actuation system
Use only BMW-approved parts for replacements
- Inspect catalytic converter efficiency
- Replace exhaust hangers if worn
- Perform full system pressure test
Consult BMW ISTA for detailed diagnostics
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the diameter of the exhaust pipes on the 2014-2020 BMW M4?
What is the diameter of the exhaust pipes on the 2014-2020 BMW M4?
The 2014-2020 BMW M4 features dual exhaust pipes with a diameter of 80mm (3.15 inches) each. This design ensures optimal exhaust flow and performance.
Q2 What material is used for the exhaust system on the BMW M4?
What material is used for the exhaust system on the BMW M4?
The exhaust system on the BMW M4 is constructed from high-quality stainless steel, which provides excellent durability and resistance to corrosion, ensuring long-term performance.
Q3 Does the BMW M4 exhaust system include a valve-controlled exhaust?
Does the BMW M4 exhaust system include a valve-controlled exhaust?
Yes, the BMW M4 is equipped with an electronically controlled exhaust flap system. This system adjusts the exhaust note and backpressure based on driving conditions and mode selection (e.g., Comfort, Sport, or Sport+).
Q4 What is the weight of the stock exhaust system on the BMW M4?
What is the weight of the stock exhaust system on the BMW M4?
The stock exhaust system on the BMW M4 weighs approximately 22.5 kg (49.6 lbs). This includes the muffler, pipes, and valve-controlled components.
Q5 Can the BMW M4 exhaust system be upgraded for better performance?
Can the BMW M4 exhaust system be upgraded for better performance?
Yes, the BMW M4 exhaust system can be upgraded with aftermarket options, such as cat-back or axle-back systems, which may reduce weight, improve flow, and enhance sound. However, modifications should be performed by professionals to ensure compatibility and avoid voiding the warranty.
Q6 What is the backpressure specification for the BMW M4 exhaust system?
What is the backpressure specification for the BMW M4 exhaust system?
The backpressure in the BMW M4 exhaust system is optimized for performance, typically ranging between 0.5 to 1.0 psi under normal operating conditions. This ensures efficient exhaust gas evacuation and engine performance.
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.
Exhaust Valve Control System Overview
Coming SoonLearn about the electronically controlled exhaust flap system and its operation in the BMW M4.
Stainless Steel Exhaust Maintenance Tips
Coming SoonBest practices for maintaining and cleaning stainless steel exhaust systems to ensure longevity and performance.
BMW M4 Performance Exhaust Upgrades
Coming SoonExplore aftermarket exhaust options for the BMW M4, including performance gains and installation considerations.
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