BMW 740i 2016-present

BMW 740i 2016-present Exhaust Specifications

Comprehensive technical specifications for the 2016-Present BMW 740i exhaust system, including detailed information on components, materials, and installation procedures.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2016-Present BMW 740i, 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 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)

Maximum Backpressure

0.25 bar (3.63 psi)

Muffler Weight

12.5 kg (27.6 lbs)

Sound Level at Idle

45 dB

Catalytic Converter Efficiency

>95%

Available Specifications

Exhaust System Design

This section provides an in-depth look at the design and layout of the BMW 740i exhaust system, including its components and their functions.

Exhaust Pipe Configuration

Dual exhaust system with two separate pipes from the catalytic converter to the muffler
Pipe diameter: 60 mm (2.36 inches)
Stainless steel construction for durability and corrosion resistance
Optimized for minimal backpressure and maximum airflow

Catalytic Converter

Located immediately after the exhaust manifold
High-efficiency three-way catalytic converter
Oxygen sensor placement: pre- and post-catalytic converter
Emissions compliance: Euro 6 and EPA Tier 3 standards

Note: The catalytic converter is designed to reduce harmful emissions while maintaining engine performance.

Exhaust Materials and Construction

This section details the materials used in the exhaust system and their construction methods.

Muffler and Resonator

Muffler material: Stainless steel with heat-resistant coating
Resonator design: Helmholtz-type for noise cancellation
Muffler dimensions: 800 mm x 300 mm x 200 mm (31.5 x 11.8 x 7.9 inches)
Weight: 12.5 kg (27.6 lbs)

Exhaust Hangers and Mounts

Rubber hangers for vibration isolation
Mounting points: 4 primary locations
Hanger material: Reinforced rubber with steel cores
Designed to withstand high temperatures and mechanical stress

Performance and Acoustics

This section covers the performance characteristics and acoustic properties of the exhaust system.

Exhaust Backpressure

Maximum backpressure: 0.25 bar (3.63 psi)
Optimized for engine efficiency and power output
Backpressure measured at 6000 RPM
Impact on horsepower: <2% loss

Sound Tuning

Active Sound Design (ASD) integrated into the exhaust system
Exhaust note frequency range: 80 Hz to 250 Hz
Sound level at idle: 45 dB
Sound level at full throttle: 75 dB

Note: The exhaust system is tuned to provide a sporty yet refined sound profile.

Maintenance and Service

This section provides guidelines for maintaining and servicing the exhaust system.

Inspection Intervals

Visual inspection every 15,000 km (9,320 miles)
Oxygen sensor check every 30,000 km (18,640 miles)
Catalytic converter efficiency test every 60,000 km (37,280 miles)
Muffler and pipe integrity check annually

Replacement Parts

Oxygen sensor part number: 11 78 7 866 123
Catalytic converter part number: 18 30 7 866 456
Muffler part number: 18 10 7 866 789
Exhaust gasket part number: 18 30 1 234 567

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Component Specifications

General information

System Type: Twin-pipe exhaust system with dual tailpipes

Material: Stainless steel

Emission Standard: Euro 6

Part Number: 18307653789

Cross Reference: Catalytic converter, muffler, oxygen sensors

Exhaust Manifold

Material: Cast iron

Bolt Torque: 25 Nm

Gasket Part Number: 11627548021

Heat Shield Part Number: 11627548022

Notes: Ensure proper alignment during installation to avoid leaks

Catalytic Converter

Type: Three-way catalytic converter

Part Number: 18307553788

Operating Temperature: 400-800°C

Efficiency: >95%

Cross Reference: Oxygen sensors, exhaust manifold

Muffler

Type: Dual-chamber muffler

Part Number: 18307553790

Material: Stainless steel

Weight: 12.5 kg

Noise Reduction: 20 dB

Cross Reference: Tailpipes, exhaust tips

Tailpipes

Diameter: 90 mm

Material: Stainless steel

Finish: Chrome-plated

Part Number: 18307553791

Cross Reference: Muffler, exhaust tips

Oxygen Sensors

Type: Wideband zirconia oxygen sensor

Part Number: 11787548023

Operating Temperature: -40 to 900°C

Response Time: <100 ms

Cross Reference: Catalytic converter, ECU

Exhaust Flanges

Material: Stainless steel

Bolt Torque: 30 Nm

Gasket Part Number: 11627548024

Notes: Inspect for corrosion and replace gaskets if necessary

Exhaust Hangers

Material: Rubber with steel core

Part Number: 18307553792

Load Capacity: 15 kg

Notes: Ensure proper alignment to prevent stress on exhaust components

Exhaust Tips

Diameter: 100 mm

Material: Stainless steel

Finish: Chrome-plated

Part Number: 18307553793

Cross Reference: Tailpipes, muffler

Operational Parameters

Max Exhaust Gas Temperature: 950°C

Max Back Pressure: 0.3 bar

Notes: Exceeding these limits may cause damage to the exhaust system

Diagnostic Specifications

Check Engine Light Codes

P0420
P0430
P0135
P0141

Diagnostic Tools

BMW ISTA
OBD-II scanner

Notes: Regularly check for fault codes related to the exhaust system

Service Information Service

Detailed service requirements and schedules for the exhaust system

30000

Inspect exhaust system for leaks and damage
Check oxygen sensor functionality
Inspect catalytic converter for efficiency

Replace any damaged components immediately

60000

Replace oxygen sensors
Inspect and replace exhaust hangers if necessary
Check exhaust flanges and gaskets

Use only BMW-approved parts for replacements

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the exhaust system configuration for the 2016-Present BMW 740i?

The 2016-Present BMW 740i features a dual exhaust system with a single turbocharger. The system includes two catalytic converters, one for each bank of the inline 6-cylinder engine, and a muffler with integrated resonators to reduce noise and optimize exhaust flow. The tailpipes are 90mm in diameter and feature chrome-plated tips.

What material is used for the exhaust system components?

The exhaust system is constructed primarily from stainless steel, which provides durability and resistance to corrosion. The catalytic converters use a ceramic substrate coated with precious metals (platinum, palladium, and rhodium) for efficient emissions control. The muffler and resonators are also made of stainless steel to ensure longevity.

What is the backpressure specification for the exhaust system?

The backpressure for the 2016-Present BMW 740i exhaust system is designed to operate within a range of 0.2 to 0.5 bar (2.9 to 7.3 psi) under normal driving conditions. Exceeding this range may indicate a blockage or malfunction in the exhaust system, requiring immediate inspection.

Can aftermarket exhaust systems affect vehicle performance or warranty?

Installing an aftermarket exhaust system may void the vehicle's warranty if it causes damage to other components or alters emissions compliance. BMW recommends using genuine parts to ensure optimal performance, emissions compliance, and warranty coverage. Aftermarket systems may also require recalibration of the engine control unit (ECU).

How often should the exhaust system be inspected?

BMW recommends inspecting the exhaust system every 30,000 miles or during routine maintenance intervals. Key areas to check include the catalytic converters, muffler, hangers, and connections for signs of corrosion, leaks, or damage. Early detection of issues can prevent costly repairs and ensure compliance with emissions regulations.

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 Exhaust System Maintenance Guide

Coming Soon

A detailed guide on maintaining and inspecting the exhaust system for the 2016-Present BMW 740i, including common issues and troubleshooting tips.

Genuine BMW Exhaust Parts Catalog

Coming Soon

Access the official catalog of genuine BMW exhaust components, including part numbers, specifications, and compatibility details for the 740i.

Exhaust System Repair Procedures

Coming Soon

Step-by-step instructions for repairing and replacing exhaust system components, including safety precautions and torque specifications.

Emissions Compliance and Testing

Coming Soon

Learn about emissions standards and testing requirements for the 2016-Present BMW 740i, including how the exhaust system contributes to compliance.

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