BMW 745i 2002-2009 Exhaust Specifications
Detailed technical specifications and documentation for the exhaust system of the 2002-2009 BMW 745i, including OEM parts, torque values, and installation guidelines.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2002-2009 BMW 745i, including key features, measurements, and technical details. This section provides detailed insights into the exhaust system's design, components, and performance specifications.
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 Pipe Diameter
60 mm (2.36 in)
Catalytic Converter Efficiency
>90%
Muffler Weight
8.5 kg (18.7 lbs)
Operating Temperature Range
400°C to 800°C (752°F to 1472°F)
Backpressure Range
0.3-0.5 bar
Available Specifications
Exhaust System Overview
This section provides an overview of the exhaust system, including its components, layout, and primary functions.
Exhaust System Overview
This section provides an overview of the exhaust system, including its components, layout, and primary functions.
System Layout
- Dual exhaust system with two separate pipes from the catalytic converter to the mufflers
- Stainless steel construction for durability and corrosion resistance
- Total system length: 4.2 meters (13.8 feet)
- Includes two catalytic converters, two mufflers, and connecting pipes
Primary Functions
- Reduces engine noise through mufflers
- Minimizes harmful emissions via catalytic converters
- Optimizes exhaust gas flow for improved engine performance
- Maintains backpressure within optimal range (0.3-0.5 bar)
Note: The exhaust system is designed to meet Euro 4 emission standards.
Catalytic Converters
This section details the catalytic converters, including their specifications, materials, and performance metrics.
Catalytic Converters
This section details the catalytic converters, including their specifications, materials, and performance metrics.
Specifications
- Material: Ceramic honeycomb substrate with platinum, palladium, and rhodium coating
- Dimensions: 300 mm (11.8 in) length, 120 mm (4.7 in) diameter
- Operating temperature range: 400°C to 800°C (752°F to 1472°F)
- Efficiency: Reduces CO, HC, and NOx emissions by over 90%
Installation and Maintenance
- Located downstream of the exhaust manifolds
- Requires periodic inspection for clogging or damage
- Replacement interval: Typically 160,000 km (100,000 miles)
- Torque specification for mounting bolts: 40 Nm (29.5 lb-ft)
Note: Avoid using leaded fuel, as it can damage the catalytic converter.
Mufflers and Resonators
This section covers the mufflers and resonators, including their design, materials, and acoustic performance.
Mufflers and Resonators
This section covers the mufflers and resonators, including their design, materials, and acoustic performance.
Muffler Specifications
- Material: Stainless steel with internal sound-absorbing fiberglass
- Dimensions: 600 mm (23.6 in) length, 200 mm (7.9 in) diameter
- Weight: 8.5 kg (18.7 lbs) per muffler
- Noise reduction: Reduces exhaust noise by 20-25 dB
Resonator Details
- Located between the catalytic converter and muffler
- Material: Stainless steel with perforated internal tubes
- Dimensions: 300 mm (11.8 in) length, 150 mm (5.9 in) diameter
- Function: Reduces specific frequency ranges of exhaust noise
Note: The resonator is optional and may not be present in all configurations.
Exhaust Pipes and Connections
This section provides details on the exhaust pipes, including their dimensions, materials, and connection points.
Exhaust Pipes and Connections
This section provides details on the exhaust pipes, including their dimensions, materials, and connection points.
Pipe Specifications
- Material: 409-grade stainless steel
- Diameter: 60 mm (2.36 in) for primary pipes, 50 mm (1.97 in) for secondary pipes
- Wall thickness: 1.5 mm (0.06 in)
- Total length: 2.8 meters (9.2 feet) per side
Connection Points
- Flange connections at the exhaust manifold and catalytic converter
- Clamp connections between pipes and mufflers
- Gasket material: Graphite-impregnated stainless steel
- Torque specification for flange bolts: 25 Nm (18.4 lb-ft)
Note: Ensure all connections are properly sealed to prevent exhaust leaks.
Search Specifications
Search by specification name, value, or description
Type to search through torque specifications. Results will appear below as you type.
Component Specifications
General Specifications
- System Type
- Dual exhaust with catalytic converters
- Material
- Stainless steel
- Configuration
- Rear-mounted mufflers with dual tailpipes
- Emission Standard
- EU4 compliant
- Part Number
- 18307548063
Exhaust Manifold
- Material
- Cast iron
- Bolt Torque
- 25 Nm
- Gasket Part Number
- 11627548061
- Heat Shield Part Number
- 11627548062
- Notes
- Ensure proper alignment during installation to avoid leaks
Catalytic Converters
- Type
- Two-way catalytic converter
- Location
- Integrated into exhaust manifold
- Part Number
- 18307548064
- Operating Temperature
- 400-800°C
- Efficiency
- >95%
- Notes
- Monitor for clogging or damage to maintain emission standards
Oxygen Sensors
- Quantity
- 4
- Location
-
- Pre-catalytic converter
- Post-catalytic converter
- Part Number
-
- 11787548065
- 11787548066
- Operating Voltage
- 0.1-0.9V
- Response Time
- <100ms
- Notes
- Replace sensors every 100,000 miles or as per diagnostic codes
Mufflers
- Type
- Dual-chamber muffler
- Material
- Stainless steel
- Part Number
- 18307548067
- Dimensions
- 800mm x 300mm x 200mm
- Weight
- 12.5 kg
- Notes
- Inspect for rust or damage during routine maintenance
Exhaust Pipes
- Diameter
- 70mm
- Material
- Stainless steel
- Wall Thickness
- 1.5mm
- Part Number
- 18307548068
- Notes
- Ensure proper alignment and secure mounting to prevent vibrations
Exhaust Clamps
- Type
- U-bolt clamps
- Material
- Stainless steel
- Torque Specification
- 15 Nm
- Part Number
- 18307548069
- Notes
- Inspect for corrosion and replace if necessary
Exhaust Hangers
- Material
- Rubber with steel reinforcement
- Quantity
- 6
- Part Number
- 18307548070
- Notes
- Check for wear and tear during routine inspections
Exhaust Heat Shields
- Material
- Aluminum
- Part Number
- 18307548071
- Location
-
- Underbody
- Near catalytic converters
- Notes
- Ensure proper installation to prevent heat damage to surrounding components
Diagnostic Specifications
- Common Fault Codes
-
- P0420
- P0430
- P0135
- P0141
- Diagnostic Tools
-
- BMW ISTA
- OBD-II scanner
- Notes
- Regularly check for fault codes and address issues promptly to avoid further damage
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks or damage
- Check oxygen sensor functionality
- Inspect catalytic converters for clogging
Perform visual and functional checks during routine maintenance
- Replace oxygen sensors if necessary
- Inspect and tighten exhaust clamps
- Check exhaust hangers for wear
Replace components as needed to maintain system integrity
- Replace catalytic converters if efficiency drops below 90%
- Inspect and replace mufflers if damaged
- Perform full exhaust system diagnostic
Ensure compliance with emission standards and optimal performance
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the diameter of the exhaust pipes on a 2002-2009 BMW 745i?
What is the diameter of the exhaust pipes on a 2002-2009 BMW 745i?
The exhaust pipes on the 2002-2009 BMW 745i have an outer diameter of 70mm (2.75 inches). This measurement is consistent across the dual exhaust system, which is designed to optimize exhaust flow and reduce backpressure.
Q2 What type of catalytic converter is used in the 2002-2009 BMW 745i?
What type of catalytic converter is used in the 2002-2009 BMW 745i?
The 2002-2009 BMW 745i is equipped with a dual catalytic converter system, featuring two high-flow, ceramic monolith catalytic converters. These converters are designed to meet Euro 4 emissions standards and are located in the downpipes near the exhaust manifolds.
Q3 What is the recommended torque specification for exhaust manifold bolts?
What is the recommended torque specification for exhaust manifold bolts?
The exhaust manifold bolts on the 2002-2009 BMW 745i should be torqued to 25 Nm (18.4 ft-lbs) during installation. It is crucial to follow the manufacturer's tightening sequence to ensure proper sealing and prevent exhaust leaks.
Q4 How often should the exhaust system be inspected for wear or damage?
How often should the exhaust system be inspected for wear or damage?
The exhaust system should be inspected every 30,000 miles or during routine maintenance intervals. Pay special attention to the condition of the exhaust hangers, gaskets, and welds, as well as signs of corrosion or cracks in the pipes and mufflers.
Q5 Can aftermarket exhaust systems void the vehicle's warranty?
Can aftermarket exhaust systems void the vehicle's warranty?
Installing an aftermarket exhaust system may void the vehicle's warranty if it is determined that the modification caused damage to other components. Always consult your BMW dealership or warranty documentation before making modifications to ensure compliance with warranty terms.
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 Service Manual
Coming SoonOfficial BMW service manual detailing exhaust system components, removal, installation, and torque specifications.
Exhaust System Maintenance Guide
Coming SoonComprehensive guide on maintaining and inspecting the exhaust system, including common issues and troubleshooting tips.
Genuine BMW Exhaust Parts Catalog
Coming SoonCatalog of genuine BMW exhaust components, including gaskets, hangers, and catalytic converters, with part numbers and compatibility details.
Exhaust System Safety and Installation Tips
Coming SoonSafety guidelines and best practices for working on the exhaust system, including proper lifting and handling procedures.
About the Author
Expert automotive knowledge and experience
'/%3E%3Cpath d='M60 30a20 20 0 1 1 0 40 20 20 0 0 1 0-40zm0 45c16.5 0 30 7.5 30 16.8V100H30v-8.2c0-9.3 13.5-16.8 30-16.8z' fill='%23404040'/%3E%3C/svg%3E)
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
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.