BMW M3 2021-present

BMW M3 2021-present Exhaust Specifications

Comprehensive technical documentation for the exhaust system of the 2021-Present BMW M3, including detailed specifications, component descriptions, and performance data.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2021-Present BMW M3, including key features, measurements, and technical details. This section covers the exhaust system's design, materials, performance characteristics, and maintenance requirements.

How to Use

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)

Sound Pressure Level

95 dB (Sport+ mode)

Flow Rate

450 CFM at 6000 RPM

Catalytic Converter Lifespan

100,000 miles (160,000 km)

Valve Actuation Time

< 300 ms

Available Specifications

Exhaust System Design

This section provides an in-depth look at the design and construction of the BMW M3's exhaust system, including materials, layout, and integration with the vehicle's performance systems.

Exhaust Layout and Configuration

Twin-pipe exhaust system with dual tailpipes
Stainless steel construction for durability and corrosion resistance
Integrated valve-controlled exhaust system for adjustable sound profiles
Exhaust diameter: 80 mm (3.15 in) for optimal flow
Lightweight design to reduce overall vehicle weight

Materials and Coatings

High-grade stainless steel used for all primary components
Heat-resistant ceramic coating on the exhaust manifold
Chrome-plated tailpipes for aesthetic appeal
Thermal insulation to reduce underbody heat transfer
Corrosion-resistant coatings for extended lifespan

Note: The ceramic coating on the exhaust manifold improves thermal efficiency and reduces engine bay temperatures.

Performance Characteristics

This section details the performance aspects of the exhaust system, including sound profiles, backpressure management, and impact on engine performance.

Sound Profiles and Valve Control

Adjustable exhaust sound via integrated valve system
Three sound modes: Comfort, Sport, and Sport+
Valve actuation time: < 300 ms for rapid response
Sound pressure level: 95 dB at full throttle in Sport+ mode
Tailored exhaust note for enhanced driving experience

Backpressure and Flow Dynamics

Optimized backpressure for improved engine efficiency
Flow rate: 450 CFM (cubic feet per minute) at 6000 RPM
Pressure drop across the catalytic converter: < 2.5 psi
Designed to minimize turbulence and maximize exhaust gas evacuation
Supports up to 503 hp engine output

Note: The exhaust system is engineered to balance backpressure and flow for optimal performance across all driving conditions.

Maintenance and Service

This section covers the maintenance requirements, inspection procedures, and service intervals for the BMW M3 exhaust system.

Inspection and Cleaning

Inspect exhaust system every 10,000 miles (16,000 km)
Check for cracks, leaks, and corrosion during routine maintenance
Clean tailpipes with non-abrasive cleaners to maintain appearance
Inspect valve actuators for proper operation
Verify mounting brackets and hangers for secure fit

Replacement and Repair

Catalytic converter replacement interval: 100,000 miles (160,000 km)
Muffler lifespan: 150,000 miles (240,000 km) under normal conditions
Use only OEM parts for replacements to ensure compatibility
Torque specifications for exhaust manifold bolts: 25 Nm (18.4 lb-ft)
Replace gaskets and seals during any exhaust component replacement

Note: Using non-OEM parts may void the vehicle's warranty and affect performance.

Search Specifications

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Component Specifications

General

Material: Stainless steel

System Type: Twin-pipe exhaust system with M Sport exhaust

Emission Standard: Euro 6d-TEMP

Part Number: 18308643567

Weight: 22.5 kg

Exhaust Manifold

Material: Cast iron

Part Number: 11627848456

Bolt Torque: 25 Nm

Gasket Material: Graphite

Gasket Part Number: 11627848457

Catalytic Converter

Type: Three-way catalytic converter

Part Number: 18308643568

Substrate Material: Ceramic

Precious Metals

Platinum
Palladium
Rhodium

Operating Temperature: 400-800 °C

Efficiency: >95%

Resonator

Material: Stainless steel

Part Number: 18308643569

Diameter: 80 mm

Length: 450 mm

Function: Reduces exhaust noise and drone

Muffler

Material: Stainless steel

Part Number: 18308643570

Diameter: 90 mm

Length: 600 mm

Sound Level: 85 dB at 3000 rpm

Valve Control: Electronically controlled exhaust flap

Tailpipes

Material: Chrome-plated stainless steel

Part Number: 18308643571

Diameter: 100 mm

Quantity: 4

Design: Quad exhaust tips

Exhaust Flap

Type: Electronically controlled

Part Number: 18308643572

Actuator Type: Stepper motor

Control Signal: PWM signal from ECU

Operating Voltage: 12 V

Sensors

Oxygen Sensor: Type: Wideband lambda sensor
Part Number: 11787586934
Operating Temperature: -40 to 900 °C
Signal Type: 0.1-0.9 V

Temperature Sensor: Type: Exhaust gas temperature sensor
Part Number: 11787586935
Operating Temperature: -40 to 1000 °C
Signal Type: 0-5 V

Mounting

Rubber Mounts: Part Number: 18308643573
Quantity: 4
Durometer: 70 Shore A

Bracket Material: Stainless steel

Bracket Part Number: 18308643574

Bolt Torque: 30 Nm

Maintenance

inspection Interval: Every 30,000 miles or 24 months

Cleaning Requirements: Inspect and clean tailpipes every 10,000 miles

Torque Check: Check all exhaust bolts and mounts every 15,000 miles

Gasket Replacement: Replace exhaust manifold gasket every 60,000 miles

Diagnostics

Common Faults

Exhaust leak at manifold gasket
Failed oxygen sensor
Stuck exhaust flap
Cracked catalytic converter

Diagnostic Tools

BMW ISTA diagnostic software
OBD-II scanner
Exhaust gas analyzer

Error Codes

P0420 - Catalyst System Efficiency Below Threshold
P0135 - O2 Sensor Heater Circuit Malfunction
P0491 - Secondary Air Injection System Insufficient Flow

Service Information Service

Detailed service requirements and schedules for the exhaust system

10,000 miles

12 months

Inspect exhaust system for leaks
Check exhaust mounts and brackets
Clean tailpipes

Ensure all bolts are torqued to specification

30,000 miles

24 months

Inspect catalytic converter
Check oxygen sensor operation
Inspect exhaust flap operation

Use BMW ISTA for diagnostic checks

60,000 miles

48 months

Replace exhaust manifold gasket
Inspect and clean resonator
Check muffler for corrosion

Replace any worn or damaged components

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of exhaust system does the 2021-Present BMW M3 use?

The 2021-Present BMW M3 is equipped with a high-performance stainless steel exhaust system featuring dual tailpipes. The system includes an electronically controlled exhaust flap for adjustable sound profiles, with a diameter of 80mm for the tailpipes. It is designed to optimize exhaust flow and reduce backpressure, enhancing engine performance.

What is the sound output level of the BMW M3 exhaust?

The BMW M3 exhaust system produces a sound output of approximately 95 dB(A) under full load, measured at 1 meter distance. The electronically controlled exhaust flap allows drivers to switch between a quieter 'Comfort' mode and a more aggressive 'Sport+' mode for enhanced auditory feedback.

Can the BMW M3 exhaust system be upgraded or modified?

Yes, the BMW M3 exhaust system can be upgraded with aftermarket performance exhausts or modified with components like downpipes or resonators. However, modifications may void the vehicle's warranty and should be performed by certified professionals to ensure compatibility and safety. Always consult BMW's official guidelines before making changes.

What is the recommended maintenance schedule for the BMW M3 exhaust system?

The BMW M3 exhaust system requires regular inspections every 10,000 miles or annually, whichever comes first. Key maintenance tasks include checking for corrosion, ensuring proper alignment of the exhaust components, and verifying the functionality of the exhaust flap mechanism. Use only BMW-approved cleaning agents to preserve the system's finish.

Does the BMW M3 exhaust system include a particulate filter?

Yes, the BMW M3 exhaust system is equipped with a gasoline particulate filter (GPF) to reduce emissions and comply with Euro 6d-TEMP standards. The GPF is integrated into the exhaust system and requires no additional maintenance beyond standard service intervals.

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 Soon

A detailed guide covering the design, specifications, and maintenance procedures for the BMW M3 exhaust system.

BMW Genuine Parts Catalog

Coming Soon

Access the official BMW parts catalog to find genuine exhaust components and accessories for the M3.

BMW M3 Performance Upgrades

Coming Soon

Explore approved performance upgrades for the BMW M3, including exhaust modifications and tuning options.

BMW Service and Warranty Information

Coming Soon

Learn about BMW's service requirements and warranty implications for modifications to the exhaust system.

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