BMW 750i 2001-2008

BMW 750i 2001-2008 Exhaust Specifications

Detailed technical specifications and documentation for the 2001-2008 BMW 750i exhaust system, including components, torque values, emissions compliance, and maintenance guidelines.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2001-2008 BMW 750i, 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 inches)

Catalytic Converter Efficiency

>90% reduction in CO, HC, and NOx

Muffler Weight

12 kg (26.46 lbs)

Exhaust Tip Diameter

90 mm (3.54 inches)

Total Exhaust System Length

4.5 meters (14.76 feet)

Available Specifications

Exhaust System Overview

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

Exhaust System Layout

Dual exhaust system with two separate pipes from the engine to the rear mufflers
Stainless steel construction for durability and corrosion resistance
Includes two catalytic converters, one per bank of cylinders
Exhaust pipe diameter: 60 mm (2.36 inches)
Total system length: Approximately 4.5 meters (14.76 feet)

Primary Functions

Efficient expulsion of exhaust gases from the engine
Reduction of harmful emissions via catalytic converters
Noise reduction through mufflers and resonators
Optimized backpressure for engine performance

Note: The exhaust system is designed to meet Euro 4 emissions standards.

Catalytic Converters

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

Catalytic Converter Specifications

Material: Ceramic honeycomb substrate with platinum, palladium, and rhodium coating
Operating temperature range: 400°C to 800°C (752°F to 1472°F)
Efficiency: Reduces CO, HC, and NOx emissions by over 90%
Dimensions: 300 mm (11.81 inches) length, 120 mm (4.72 inches) diameter
Weight: Approximately 5.5 kg (12.13 lbs) per converter

Installation and Maintenance

Located downstream of the exhaust manifolds
Secured with heat-resistant mounting brackets
Recommended replacement interval: 160,000 km (100,000 miles)
OBD-II system monitors catalytic converter efficiency

Note: Avoid using leaded fuel to prevent catalytic converter damage.

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 materials
Dimensions: 800 mm (31.5 inches) length, 300 mm (11.81 inches) width
Weight: Approximately 12 kg (26.46 lbs) per muffler
Acoustic performance: Reduces exhaust noise by 20-30 dB
Dual-chamber design for optimal noise cancellation

Resonator Details

Located between the catalytic converters and mufflers
Material: Stainless steel with perforated internal tubes
Dimensions: 400 mm (15.75 inches) length, 150 mm (5.91 inches) diameter
Weight: Approximately 3.5 kg (7.72 lbs) per resonator
Function: Reduces specific frequency ranges of exhaust noise

Note: Resonators are tuned to minimize drone at cruising speeds.

Exhaust Tips and Finishes

This section provides details on the exhaust tips, including their design, materials, and finishes.

Exhaust Tip Specifications

Material: Polished stainless steel
Diameter: 90 mm (3.54 inches)
Length: 150 mm (5.91 inches)
Finish: Chrome-plated for enhanced appearance
Design: Dual-wall construction for heat insulation

Installation and Alignment

Integrated into the rear bumper design
Secured with adjustable mounting brackets
Alignment tolerance: ±2 mm (0.08 inches)
Heat-resistant gaskets prevent vibration and noise

Note: Ensure proper alignment to avoid contact with the bumper.

Search Specifications

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Component Specifications

General Specifications

Material: Stainless steel

System Type: Dual exhaust with catalytic converters

Configuration: Rear-mounted mufflers with dual tailpipes

Emission Standard: Euro 3

Part Number: 18307548001

Exhaust Manifold

Material: Cast iron

Bolt Torque: 22 Nm

Gasket Part Number: 11627548002

Heat Shield Part Number: 11627548003

Notes: Ensure proper alignment during installation to avoid leaks

Catalytic Converters

Type: Three-way catalytic converter

Part Number: 18307548004

Operating Temperature: 400-800°C

Efficiency: >95%

Replacement interval: 100,000 miles

Notes: Monitor for clogging or damage to prevent engine performance issues

Oxygen Sensors

Type: Heated zirconia oxygen sensor

Part Number: 11787548005

Location: Pre-catalytic and post-catalytic

Operating Voltage: 0.1-0.9V

Replacement interval: 60,000 miles

Notes: Ensure proper wiring and connections to avoid false readings

Mufflers

Material: Stainless steel

Part Number: 18307548006

Dimensions: 800mm x 300mm x 200mm

Weight: 12 kg

Noise Reduction: 25 dB

Notes: Inspect for rust or damage, especially in wet climates

Exhaust Pipes

Material: Stainless steel

Diameter: 70 mm

Wall Thickness: 1.5 mm

Part Number: 18307548007

Notes: Check for cracks or leaks, especially at joints

Exhaust Clamps

Material: Stainless steel

Bolt Torque: 10 Nm

Part Number: 18307548008

Notes: Ensure clamps are tightened evenly to prevent leaks

Exhaust Hangers

Material: Rubber with steel core

Part Number: 18307548009

Load Capacity: 15 kg

Notes: Inspect for wear or cracking, especially in high-vibration areas

Exhaust Gaskets

Material: Graphite with steel reinforcement

Part Number: 18307548010

Temperature Rating: Up to 1000°C

Notes: Replace gaskets during any exhaust component replacement

Diagnostic Specifications

Back Pressure Limit: 1.5 psi

Oxygen Sensor Response Time: <100 ms

Catalytic Converter Efficiency Threshold: 90%

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 to ensure system integrity

60,000

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

Replace components as necessary to maintain performance

100,000

Replace catalytic converter if efficiency is below 90%
Inspect and replace exhaust gaskets
Check mufflers for rust or damage

Follow manufacturer guidelines for replacement intervals

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the diameter of the exhaust pipes on a 2001-2008 BMW 750i?

The exhaust pipes on the 2001-2008 BMW 750i have an outer diameter of 70mm (2.75 inches). This measurement is consistent across both the left and right exhaust systems.

What type of catalytic converter is used in the 2001-2008 BMW 750i?

The 2001-2008 BMW 750i is equipped with a dual catalytic converter system, featuring two high-flow, stainless steel catalytic converters. Each converter is designed to meet Euro 3 emissions standards and has a capacity of 400 cells per square inch.

What is the recommended torque specification for exhaust manifold bolts?

The exhaust manifold bolts on the 2001-2008 BMW 750i should be torqued to 25 Nm (18.4 ft-lbs). Ensure the engine is cool before tightening to avoid warping the manifold.

How often should the exhaust system be inspected for leaks or damage?

The exhaust system should be inspected every 15,000 miles or during routine maintenance. Pay special attention to the exhaust manifold gaskets, catalytic converters, and muffler connections for signs of wear, corrosion, or leaks.

Can aftermarket exhaust systems affect the vehicle's performance or warranty?

Aftermarket exhaust systems may alter the vehicle's performance, including backpressure and emissions. Using non-genuine parts can void the warranty if they cause damage to the engine or emissions system. Always consult BMW's official documentation before making modifications.

What is the material composition of the exhaust system?

The exhaust system on the 2001-2008 BMW 750i is primarily constructed from stainless steel, which provides durability and resistance to corrosion. The muffler and tailpipes are also coated with a heat-resistant finish to enhance longevity.

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 750i Exhaust System Service Manual

Coming Soon

Official BMW service manual detailing exhaust system maintenance, repair procedures, and specifications for the 2001-2008 750i.

Exhaust System Inspection Checklist

Coming Soon

A comprehensive checklist for inspecting the exhaust system, including common issues and troubleshooting tips.

Genuine BMW Exhaust Parts Catalog

Coming Soon

Catalog of genuine BMW exhaust components, including part numbers and compatibility information for the 2001-2008 750i.

Exhaust System Safety Guidelines

Coming Soon

Safety guidelines for working on the exhaust system, including handling hot components and avoiding toxic fumes.

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