BMW 650i 2003-2010

BMW 650i 2003-2010 Exhaust Specifications

Detailed technical specifications and documentation for the 2003-2010 BMW 650I exhaust system, including components, torque values, and emission standards.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2003-2010 BMW 650I, including key features, measurements, and technical details. This section provides detailed information on 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

98%

Muffler Weight

8.5 kg (18.7 lbs)

Exhaust Gas Temperature

900°C (1652°F)

Maximum Backpressure

0.5 bar (7.25 psi)

Available Specifications

Exhaust System Overview

This section provides an overview of the exhaust system, including its components, materials, and layout.

Exhaust System Components

Dual exhaust system with two independent pipes
Stainless steel construction for durability
Includes catalytic converters, mufflers, and resonators
Exhaust pipe diameter: 60 mm (2.36 in)
Total system weight: 28.5 kg (62.8 lbs)

Exhaust Layout

Rear-mounted mufflers for optimal sound damping
Dual exhaust tips with chrome finish
Exhaust routing optimized for minimal backpressure
Heat shields integrated for thermal management
Oxygen sensors located pre- and post-catalytic converters

Note: The exhaust layout is designed to enhance performance while maintaining compliance with emissions standards.

Catalytic Converters

This section details the catalytic converters, including their specifications, materials, and performance.

Catalytic Converter Specifications

Material: Ceramic substrate with platinum-rhodium coating
Diameter: 120 mm (4.72 in)
Length: 300 mm (11.81 in)
Efficiency: 98% reduction of harmful emissions
Operating temperature: 400-800°C (752-1472°F)

Oxygen Sensor Integration

Pre-catalytic converter sensor monitors air-fuel ratio
Post-catalytic converter sensor ensures emissions compliance
Sensor voltage range: 0.1-0.9 V
Sensor response time: <100 ms
Sensor operating temperature: -40 to 900°C (-40 to 1652°F)

Note: The oxygen sensors are critical for maintaining optimal engine performance and emissions control.

Mufflers and Resonators

This section covers the mufflers and resonators, including their design, materials, and acoustic performance.

Muffler Specifications

Material: Stainless steel with aluminized coating
Dimensions: 500 mm x 300 mm x 200 mm (19.69 x 11.81 x 7.87 in)
Weight: 8.5 kg (18.7 lbs) per muffler
Sound reduction: 20 dB at 3000 RPM
Internal baffle design for optimized airflow

Resonator Specifications

Material: Stainless steel
Dimensions: 250 mm x 150 mm x 100 mm (9.84 x 5.91 x 3.94 in)
Weight: 3.2 kg (7.05 lbs) per resonator
Sound tuning frequency: 120 Hz
Integrated with mufflers for balanced acoustics

Note: The resonators are designed to eliminate specific frequencies for a refined exhaust note.

Exhaust Performance

This section provides performance metrics for the exhaust system, including backpressure, flow rate, and temperature.

Backpressure and Flow Rate

Maximum backpressure: 0.5 bar (7.25 psi)
Flow rate at 6000 RPM: 450 L/s
Optimized for minimal restriction
Pressure drop across catalytic converters: 0.1 bar (1.45 psi)
Flow velocity at exhaust tips: 80 m/s

Temperature Management

Exhaust gas temperature at manifold: 900°C (1652°F)
Temperature at catalytic converter inlet: 600°C (1112°F)
Temperature at muffler outlet: 150°C (302°F)
Heat shield surface temperature: <100°C (212°F)
Thermal insulation integrated in critical areas

Note: Temperature management is critical for component longevity and safety.

Search Specifications

Search by specification name, value, or description

Component Specifications

General Specifications

Material: Stainless steel

System Type: Dual exhaust with cross-pipe

Emission Compliance: Euro 4

Part Number: 18307585263

Weight: 32.5 kg

Exhaust Manifold

Material: Cast iron

Bolt Torque: 25 Nm

Gasket Part Number: 11627548921

Heat Shield Part Number: 11627548922

Notes: Ensure proper alignment during installation to avoid leaks

Catalytic Converter

Type: Two-way catalytic converter

Part Number: 18307585264

Efficiency: 98%

Operating Temperature: 400-800°C

Replacement interval: 120,000 miles

Notes: Check for clogging or damage during routine inspections

Oxygen Sensors

Type: Wideband zirconia sensor

Part Number

11787548923
11787548924

Location

Pre-catalytic converter
Post-catalytic converter

Operating Voltage: 0.1-0.9 V

Replacement interval: 100,000 miles

Notes: Ensure proper wiring and connector integrity

Muffler

Material: Stainless steel

Part Number: 18307585265

Dimensions: 800 mm x 300 mm x 200 mm

Weight: 8.5 kg

Noise Level: 72 dB at 3000 RPM

Notes: Inspect for rust or damage during service

Exhaust Pipes

Diameter: 70 mm

Material: Stainless steel

Part Number: 18307585266

Wall Thickness: 1.5 mm

Notes: Check for cracks or leaks during routine maintenance

Exhaust Clamps

Type: U-bolt clamp

Part Number: 18307585267

Torque Specification: 15 Nm

Notes: Ensure clamps are tightened evenly to prevent leaks

Exhaust Hangers

Material: Rubber with steel core

Part Number: 18307585268

Quantity: 4

Notes: Inspect for wear or cracking during service

Exhaust Tips

Material: Chrome-plated stainless steel

Part Number: 18307585269

Diameter: 90 mm

Length: 120 mm

Notes: Ensure proper alignment and secure attachment

Diagnostic Specifications

Backpressure Limit: 0.5 bar at 3000 RPM

Oxygen Sensor Response Time: 100 ms

Catalytic Converter Efficiency Threshold: 95%

Notes: Use BMW-specific diagnostic tools for accurate readings

Service Information Service

Detailed service requirements and schedules for the exhaust system

30,000

Inspect exhaust system for leaks or damage
Check oxygen sensor functionality
Inspect catalytic converter for clogging

Perform visual and functional checks

60,000

Replace oxygen sensors if necessary
Inspect and tighten exhaust clamps
Check exhaust hangers for wear

Replace worn components as needed

120,000

Replace catalytic converter if efficiency is below 95%
Inspect and replace muffler if necessary
Perform full exhaust system diagnostic

Follow BMW-recommended replacement intervals

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the diameter of the exhaust pipes on the 2003-2010 BMW 650i?

The exhaust pipes on the 2003-2010 BMW 650i have an outer diameter of 70mm (2.75 inches). This size is optimized for the vehicle's 4.8L V8 engine to ensure proper exhaust flow and performance.

What type of catalytic converter is used in the 2003-2010 BMW 650i exhaust system?

The 2003-2010 BMW 650i is equipped with a dual catalytic converter system, featuring two high-flow metallic substrate catalytic converters. These are designed to meet Euro 4 emissions standards and ensure efficient reduction of harmful exhaust gases.

Can I replace the stock exhaust with an aftermarket system without voiding the warranty?

Replacing the stock exhaust with an aftermarket system may void the warranty if the modification is deemed to cause damage or affect the vehicle's emissions compliance. Always consult your BMW dealership or warranty documentation before making modifications.

What is the recommended service interval for inspecting the exhaust system?

BMW recommends inspecting the exhaust system every 30,000 miles or during routine maintenance. Check for signs of corrosion, leaks, or damage to the pipes, mufflers, and catalytic converters.

What material is used for the exhaust system in the 2003-2010 BMW 650i?

The exhaust system is constructed from high-quality stainless steel, which provides excellent resistance to corrosion and heat. The mufflers and tips are also made from polished stainless steel for durability and aesthetic appeal.

How does the exhaust system affect the vehicle's performance?

The exhaust system is designed to optimize backpressure and airflow, which directly impacts engine performance. A well-maintained exhaust system ensures maximum horsepower (367 HP) and torque (360 lb-ft) output for the 4.8L V8 engine.

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 650i Exhaust System Repair Manual

Coming Soon

Official BMW repair manual detailing exhaust system components, removal, and installation procedures.

Exhaust System Maintenance Guide

Coming Soon

Comprehensive guide on maintaining and troubleshooting the exhaust system for the 2003-2010 BMW 650i.

Genuine BMW Exhaust Parts Catalog

Coming Soon

Catalog of genuine BMW exhaust components, including pipes, mufflers, and catalytic converters.

Emissions Compliance and Exhaust Systems

Coming Soon

Technical document explaining emissions standards and how the BMW 650i exhaust system complies with regulations.

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.