BMW 750i 2008-2015

BMW 750i 2008-2015 Exhaust Specifications

Detailed technical specifications and documentation for the exhaust system of the 2008-2015 BMW 750i. Includes component details, torque specs, and maintenance guidelines for the N63 engine.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2008-2015 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 (Primary)

60 mm (2.36 in)

Catalytic Converter Efficiency

Up to 95%

Muffler Weight

8.5 kg (18.7 lbs)

Exhaust Tip Diameter

90 mm (3.54 in)

Total Exhaust System Weight

42.5 kg (93.7 lbs)

Available Specifications

Exhaust System Overview

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

Exhaust System Components

Dual exhaust system with two independent pathways
Stainless steel construction for durability and corrosion resistance
Integrated catalytic converters for emissions control
Twin-tube mufflers for noise reduction
Exhaust tips with chrome finish for aesthetic appeal

Exhaust System Design

Optimized for the 4.4L V8 twin-turbocharged engine
Designed to minimize backpressure for improved performance
Heat shields integrated to protect surrounding components
Active exhaust valves for dynamic sound tuning
Total system weight: 42.5 kg (93.7 lbs)

Note: The active exhaust valves are controlled by the vehicle's ECU based on driving conditions.

Exhaust Pipe Specifications

This section details the dimensions, materials, and routing of the exhaust pipes.

Primary Exhaust Pipes

Diameter: 60 mm (2.36 in)
Material: High-grade stainless steel
Wall thickness: 1.5 mm (0.059 in)
Routing: Dual pipes from the turbochargers to the catalytic converters
Heat-resistant coating to withstand high temperatures

Secondary Exhaust Pipes

Diameter: 70 mm (2.76 in)
Material: Stainless steel with aluminized coating
Wall thickness: 1.2 mm (0.047 in)
Routing: From catalytic converters to the mufflers
Flexible joints to accommodate engine movement

Catalytic Converters

This section covers the specifications and performance of the catalytic converters.

Catalytic Converter Design

Dual catalytic converters, one per exhaust bank
Ceramic honeycomb substrate with platinum and rhodium coating
Operating temperature range: 400°C to 800°C (752°F to 1472°F)
Efficiency: Reduces harmful emissions by up to 95%
Replacement interval: 160,000 km (100,000 miles)

Catalytic Converter Dimensions

Length: 300 mm (11.81 in)
Diameter: 120 mm (4.72 in)
Weight: 4.8 kg (10.6 lbs) per unit
Inlet and outlet diameter: 60 mm (2.36 in)
Mounting: Bolted to the exhaust manifold

Note: Ensure proper alignment during installation to avoid exhaust leaks.

Mufflers and Exhaust Tips

This section provides details on the mufflers and exhaust tips, including their design and specifications.

Muffler Specifications

Twin-tube design for optimal noise reduction
Material: Stainless steel with internal sound-absorbing materials
Dimensions: 600 mm x 300 mm x 200 mm (23.62 in x 11.81 in x 7.87 in)
Weight: 8.5 kg (18.7 lbs) per unit
Mounting: Rubber hangers for vibration isolation

Exhaust Tips

Diameter: 90 mm (3.54 in)
Material: Chrome-plated stainless steel
Length: 150 mm (5.91 in)
Design: Oval-shaped for a sporty appearance
Mounting: Welded to the muffler outlet

Search Specifications

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Component Specifications

General Specifications

Material: Stainless steel

System Type: Dual exhaust with quad tailpipes

Emission Standard: Euro 5 compliant

Part Number: 18307585223

Weight: 32.5 kg

Exhaust Manifold

Material: Cast iron

Bolt Torque: 25 Nm + 90°

Gasket Part Number: 11627548921

Heat Shield Material: Aluminized steel

Heat Shield Thickness: 1.5 mm

Catalytic Converter

Type: Two-way catalytic converter

Part Number: 18307585224

Substrate Material: Ceramic

Cell Density: 400 cells per square inch

Operating Temperature: 400-800°C

Replacement interval: 120,000 miles

Resonator

Material: Stainless steel

Part Number: 18307585225

Diameter: 80 mm

Length: 450 mm

Function: Reduces exhaust noise and drone

Muffler

Material: Stainless steel

Part Number: 18307585226

Diameter: 90 mm

Length: 600 mm

Noise Reduction: 25 dB

Tailpipe Diameter: 70 mm

Oxygen Sensors

Type: Wideband zirconia sensors

Upstream Sensor Part Number: 11787548922

Downstream Sensor Part Number: 11787548923

Operating Temperature: -40 to 900°C

Replacement interval: 100,000 miles

Voltage Range: 0.1-0.9 V

Exhaust Pipes

Material: Stainless steel

Diameter: 70 mm

Wall Thickness: 1.2 mm

Flex Pipe Part Number: 18307585227

Flex Pipe Length: 150 mm

Flex Pipe Material: Stainless steel braided

Mounting System

Rubber Mount Part Number: 18307585228

Mount Bolt Torque: 22 Nm

Mount Spacing: 300 mm

Mount Material: Reinforced rubber

Heat Shield Part Number: 18307585229

Emission Control

EGR System: Integrated

Secondary Air injection: Yes

Particulate Filter: Not applicable

Evaporative Emission Control: Yes

Diagnostic Port: OBD-II compliant

Performance Parameters

Back Pressure: 0.5-0.8 bar

Exhaust Gas Temperature: Max 950°C

Flow Rate: 450 liters per second

Noise Level: 74 dB at 3000 RPM

Warranty: 2 years or 24,000 miles

Service Information Service

Detailed service requirements and schedules for the exhaust system

30,000

Inspect exhaust system for leaks
Check oxygen sensor operation
Inspect catalytic converter for damage

Replace oxygen sensors if fault codes are present

60,000

Inspect and tighten exhaust mounts
Check flex pipe for cracks
Inspect heat shields for corrosion

Replace rubber mounts if excessive wear is detected

100,000

Replace oxygen sensors
Inspect catalytic converter efficiency
Check exhaust back pressure

Perform emission system diagnostic scan

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the exhaust system configuration for the 2008-2015 BMW 750i?

The 2008-2015 BMW 750i features a dual exhaust system with two tailpipes, each measuring 70mm in diameter. The system includes two catalytic converters, two mufflers, and an electronically controlled exhaust flap for optimized performance and sound.

What material is used in the exhaust system of the BMW 750i?

The exhaust system is constructed from high-quality stainless steel, ensuring durability and resistance to corrosion. The tailpipes are chrome-plated for a premium finish.

How does the exhaust flap system work in the BMW 750i?

The exhaust flap system is electronically controlled and adjusts based on driving conditions. At lower RPMs, the flap remains closed to reduce noise and improve fuel efficiency. At higher RPMs, the flap opens to enhance exhaust flow and performance.

What is the backpressure specification for the BMW 750i exhaust system?

The backpressure specification for the BMW 750i exhaust system is designed to be less than 0.5 bar (7.25 psi) under normal operating conditions to ensure optimal engine performance and efficiency.

Can aftermarket exhaust systems affect the BMW 750i's performance?

Yes, aftermarket exhaust systems can impact performance, emissions, and warranty coverage. Non-genuine parts may not meet BMW's engineering standards, potentially leading to reduced performance, increased emissions, and voiding of the vehicle's warranty.

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 the exhaust system components, maintenance procedures, and troubleshooting tips.

Exhaust System Maintenance Guide

Coming Soon

Comprehensive guide on maintaining the BMW 750i exhaust system, including inspection intervals and common issues.

Genuine BMW Exhaust Parts Catalog

Coming Soon

Catalog of genuine BMW exhaust components, including part numbers and compatibility information for the 2008-2015 750i.

Exhaust System Safety and Installation Tips

Coming Soon

Safety guidelines and professional installation tips for the BMW 750i exhaust system to ensure proper fitment and performance.

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