BMW 745i 2020-present

BMW 745i 2020-present Exhaust Specifications

Detailed technical specifications for the 2020-Present BMW 745i exhaust system, covering components, materials, dimensions, emissions compliance, and performance metrics.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2020-Present BMW 745i, including key features, measurements, and technical details. This section provides detailed insights into the exhaust system's design, components, and performance characteristics.

How to Use

Use the search function to locate specific exhaust specifications by entering keywords such as 'catalytic converter,' 'muffler,' or 'exhaust pipe diameter.'

Navigate through the exhaust documentation sections using the table of contents or by scrolling through the major sections and subsections.

Key Specifications

Exhaust System Length

4.2 meters (13.8 feet)

Main Pipe Diameter

70 mm (2.75 inches)

Catalytic Converter Efficiency

>95% reduction

Exhaust System Weight

28.5 kg (62.8 lbs)

Decibel Level at Full Throttle

85 dB

Available Specifications

Exhaust System Overview

This section provides an overview of the BMW 745i exhaust system, including its design, materials, and key components.

System Design

Dual exhaust system with quad tailpipes
Stainless steel construction for durability and corrosion resistance
Integrated exhaust flap for optimized sound and performance
Total system length: 4.2 meters (13.8 feet)
Weight: 28.5 kg (62.8 lbs)

Key Components

Two catalytic converters for emissions control
Resonators and mufflers for noise reduction
Exhaust flap actuator for dynamic sound tuning
Oxygen sensors for real-time emissions monitoring

Note: The exhaust flap is electronically controlled and adjusts based on driving conditions.

Exhaust Pipe Specifications

Detailed specifications for the exhaust pipes, including dimensions, materials, and routing.

Pipe Dimensions

Main pipe diameter: 70 mm (2.75 inches)
Tailpipe diameter: 90 mm (3.54 inches)
Wall thickness: 1.5 mm (0.059 inches)
Bend radius: 120 mm (4.72 inches)

Routing and Layout

Dual pipes from the engine to the rear axle
Symmetrical routing for balanced exhaust flow
Heat shields integrated for thermal management
Flexible joints for vibration dampening

Catalytic Converters

Technical details about the catalytic converters, including their role, specifications, and performance.

Converter Specifications

Type: Ceramic monolith with platinum-palladium-rhodium coating
Dimensions: 150 mm x 120 mm x 300 mm (5.9 x 4.7 x 11.8 inches)
Operating temperature: 400°C to 800°C (752°F to 1472°F)
Efficiency: >95% reduction in harmful emissions

Performance Features

Integrated oxygen sensors for precise air-fuel ratio control
Heat-resistant stainless steel housing
Designed for Euro 6d emissions standards
Service life: Up to 160,000 km (100,000 miles)

Note: Regular inspection is recommended to ensure optimal performance.

Exhaust Sound and Tuning

Details about the exhaust sound characteristics and tuning features.

Sound Design

Active exhaust flap for adjustable sound profiles
Sport mode enhances exhaust note for a more aggressive tone
Decibel level at idle: 45 dB
Decibel level at full throttle: 85 dB

Tuning Features

Electronically controlled exhaust flap
Integration with BMW Drive Mode Selector
Customizable sound profiles via iDrive system
Valve timing optimized for performance and acoustics

Search Specifications

Search by specification name, value, or description

Component Specifications

General Specifications

System Type: Twin-pipe exhaust system with dual tailpipes

Material: Stainless steel with chrome-plated tailpipes

Emission Standard: Euro 6d-TEMP

Part Number: 18307598901

Weight: 28.5 kg

Exhaust Manifold

Material: Cast iron with heat-resistant coating

Part Number: 11627548902

Bolt Torque: 25 Nm + 90°

Gasket Material: Graphite-impregnated steel

Heat Shield Material: Aluminized steel

Catalytic Converter

Type: Close-coupled catalytic converter

Part Number: 18307598903

Substrate Material: Ceramic with palladium and rhodium coating

Operating Temperature: 400°C to 800°C

Efficiency: >95%

Backpressure Limit: 0.3 bar at 3000 rpm

Muffler

Type: Twin-chamber muffler with integrated resonator

Part Number: 18307598904

Material: Stainless steel with acoustic insulation

Noise Level: 72 dB at 3000 rpm

Backpressure: 0.15 bar at 2500 rpm

Tailpipes

Diameter: 90 mm

Material: Chrome-plated stainless steel

Part Number: 18307598905

Finish: High-gloss chrome

Alignment Tolerance: ±2 mm

Oxygen Sensors

Type: Wideband lambda sensors

Part Number: 11787548906

Location

Pre-catalytic converter
Post-catalytic converter

Operating Temperature: -40°C to 900°C

Response Time: <100 ms

Exhaust Flaps

Type: Electronically controlled exhaust flaps

Part Number: 18307598907

Actuation Type: Electric motor with position feedback

Operating Temperature: -40°C to 300°C

Response Time: <500 ms

Mounting System

Rubber Mounts: Part Number: 18307598908
Material: Heat-resistant rubber with steel inserts
Durability: 100,000 km or 10 years

Bracket Material: Galvanized steel

Bolt Torque: 40 Nm

Thermal Management

Heat Shields: Material: Aluminized steel
Thickness: 1.5 mm
Part Number: 18307598909

insulation: Type: Ceramic fiber insulation
Thickness: 10 mm
Temperature Resistance: Up to 1000°C

Diagnostic Specifications

Error Codes

P0420
P0430
P0135
P0141

Diagnostic Tool: BMW ISTA

Sensor Check interval: Every 30,000 km

Backpressure Test interval: Every 60,000 km

Service Information Service

Detailed service requirements and schedules for the exhaust system

30,000 km

Inspect exhaust system for leaks and damage
Check oxygen sensor functionality
Verify exhaust flap operation

Replace oxygen sensors if fault codes are present

60,000 km

Inspect catalytic converter for efficiency
Check muffler and tailpipes for corrosion
Test exhaust backpressure

Replace catalytic converter if efficiency drops below 90%

100,000 km

Replace rubber mounts
Inspect heat shields for damage
Check exhaust system alignment

Ensure all bolts are torqued to specification

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the exhaust system configuration for the 2020-Present BMW 745I?

The BMW 745I features a dual exhaust system with two stainless steel pipes, each measuring 76mm in diameter. It incorporates a turbocharged exhaust manifold and a catalytic converter compliant with Euro 6 emission standards.

What materials are used in the BMW 745I exhaust system?

The exhaust system is constructed using high-grade stainless steel for the pipes and a heat-resistant alloy for the manifold. The catalytic converter uses a ceramic substrate coated with platinum and palladium.

How does the BMW 745I exhaust system handle emissions?

The system includes a sophisticated catalytic converter and an exhaust gas recirculation (EGR) system, reducing CO2 emissions by up to 30% and ensuring compliance with stringent environmental regulations.

What is the maintenance interval for the BMW 745I exhaust system?

BMW recommends inspecting the exhaust system every 20,000 miles or two years. Key components like the catalytic converter and EGR valve should be checked for efficiency and wear.

Can aftermarket exhaust parts affect the vehicle's warranty?

Using non-genuine BMW exhaust parts can void the vehicle's warranty. BMW advises using only OEM-certified parts to maintain warranty coverage and ensure optimal performance.

What safety precautions should be taken when servicing the exhaust system?

Always let the exhaust system cool down before servicing. Use protective gloves and ensure proper ventilation to avoid inhaling harmful gases. Follow BMW's official service procedures to prevent accidents.

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 745I Exhaust System Technical Manual

Coming Soon

Detailed technical manual covering the exhaust system's components, maintenance procedures, and troubleshooting tips.

Euro 6 Emission Standards Compliance Guide

Coming Soon

A guide explaining how the BMW 745I exhaust system meets Euro 6 emission standards and environmental regulations.

Exhaust Maintenance Best Practices

Coming Soon

Best practices for maintaining the BMW 745I exhaust system, including tips for inspection and component replacement.

Genuine BMW Exhaust Parts Catalog

Coming Soon

Catalog of all genuine BMW exhaust parts recommended for the 745I model, ensuring warranty compliance and optimal performance.

About the Author

Expert automotive knowledge and experience

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.