BMW 850i 2018-present

BMW 850i 2018-present Exhaust Specifications

Detailed technical specifications for the 2018-Present BMW 850i exhaust system, covering components, materials, dimensions, and performance. Ideal for technicians, enthusiasts, and repair professionals.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2018-Present BMW 850i, including key features, measurements, and technical details. This section provides detailed insights into the exhaust system's design, components, and performance characteristics.

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

70 mm (2.75 inches)

Catalytic Converter Efficiency

98% reduction

Muffler Weight

12 kg (26.45 lbs)

Tailpipe Diameter

90 mm (3.54 inches)

Exhaust System Material

Stainless steel

Available Specifications

Exhaust System Overview

This section provides an overview of the BMW 850i's exhaust system, including its design, materials, and key components.

System Design and Layout

Dual exhaust system with quad tailpipes
Stainless steel construction for durability and corrosion resistance
Optimized for performance and sound tuning
Integrated with the vehicle's M Sport package for enhanced performance

Key Components

Twin-scroll turbochargers for improved exhaust gas flow
High-flow catalytic converters for reduced emissions
Active exhaust valves for customizable sound profiles
Muffler designed for minimal backpressure

Note: The active exhaust valves are controlled via the vehicle's driving mode settings.

Exhaust Pipe Specifications

Detailed specifications for the exhaust pipes, including dimensions, materials, and performance characteristics.

Primary Exhaust Pipes

Diameter: 70 mm (2.75 inches)
Material: Stainless steel with heat-resistant coating
Length: 1,200 mm (47.24 inches)
Designed for optimal exhaust gas flow

Secondary Exhaust Pipes

Diameter: 60 mm (2.36 inches)
Material: Stainless steel with heat-resistant coating
Length: 800 mm (31.5 inches)
Connects to the muffler and tailpipes

Catalytic Converter Specifications

Technical details about the catalytic converters, including their design, efficiency, and emissions compliance.

Primary Catalytic Converter

Type: High-flow ceramic substrate
Efficiency: 98% reduction in harmful emissions
Temperature range: Up to 900°C (1,652°F)
Compliance: Euro 6 and EPA Tier 3 standards

Secondary Catalytic Converter

Type: Metallic substrate
Efficiency: 95% reduction in harmful emissions
Temperature range: Up to 800°C (1,472°F)
Compliance: Euro 6 and EPA Tier 3 standards

Note: The secondary catalytic converter is located closer to the muffler for additional emissions control.

Muffler and Tailpipe Specifications

Detailed information about the muffler and tailpipes, including their design, materials, and performance impact.

Muffler Design

Material: Stainless steel with sound-dampening insulation
Chamber design: Dual-chamber for optimal sound tuning
Weight: 12 kg (26.45 lbs)
Backpressure: Minimal for improved performance

Tailpipe Specifications

Diameter: 90 mm (3.54 inches)
Material: Chrome-plated stainless steel
Length: 300 mm (11.81 inches)
Design: Quad tailpipes with trapezoidal tips

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Component Specifications

General Specifications

Material: Stainless Steel

System Type: Dual Exhaust with M Sport Exhaust Option

Emission Standard: Euro 6d-TEMP

Part Number: 18307654321

Weight: 28.5 kg

Exhaust Manifold

Material: Cast Iron

Part Number: 18307654322

Bolt Torque: 25 Nm

Gasket Material: Graphite

Heat Shield Material: Aluminum

Catalytic Converter

Type: Dual Catalytic Converters

Material: Ceramic Substrate

Part Number: 18307654323

Efficiency: >98%

Operating Temperature: 400-800°C

Replacement interval: 120,000 miles

Resonator

Type: Dual Resonators

Material: Stainless Steel

Part Number: 18307654324

Diameter: 70 mm

Length: 400 mm

Muffler

Type: Dual Mufflers

Material: Stainless Steel

Part Number: 18307654325

Sound Level: 72 dB at 3000 RPM

Valve Control: Electronically Controlled Flap

Tailpipes

Material: Chrome-Plated Stainless Steel

Diameter: 90 mm

Part Number: 18307654326

Finish: Polished

Alignment Tolerance: ±2 mm

Exhaust Flaps

Type: Electronically Controlled

Part Number: 18307654327

Actuation Speed: 0.5 seconds

Operating Temperature Range: -40°C to 150°C

Failure Mode: Default Open

Mounting System

Hanger Material: Rubber with Steel Core

Part Number: 18307654328

Bolt Torque: 22 Nm

Vibration Damping: 85%

Alignment Tolerance: ±3 mm

Operational Parameters

Max Exhaust Gas Temperature: 950°C

Back Pressure Limit: 0.3 bar

Flow Rate: 450 CFM

Idle Rpm Back Pressure: 0.05 bar

Diagnostic Specifications

O2 Sensor Type: Wideband

O2 Sensor Part Number: 18307654329

Sensor Location: Pre and Post Catalytic Converter

Fault Codes

P0420
P0430
P0135

Diagnostic Tool: BMW ISTA

Service Information Service

Detailed service requirements and schedules for the exhaust system

30,000 miles

24 months

Inspect exhaust system for leaks
Check mounting system for wear
Inspect catalytic converter for damage

Replace gaskets if any leaks are detected

60,000 miles

48 months

Inspect and clean O2 sensors
Check exhaust flap operation
Inspect resonator and muffler for corrosion

Lubricate exhaust flap mechanism if necessary

120,000 miles

96 months

Replace catalytic converter
Inspect and replace exhaust hangers if necessary
Check entire exhaust system for alignment

Use only BMW-approved replacement parts

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the exhaust system configuration for the 2018-Present BMW 850i?

The 2018-Present BMW 850i features a dual exhaust system with two tailpipes, each measuring 90mm in diameter. The system includes electronically controlled exhaust flaps that optimize backpressure and sound characteristics based on driving conditions and mode selection.

What materials are used in the exhaust system of the BMW 850i?

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

How does the exhaust system impact performance in the BMW 850i?

The exhaust system is designed to minimize backpressure, enhancing the performance of the 4.4L V8 TwinPower Turbo engine. It contributes to a maximum output of 523 horsepower and 553 lb-ft of torque, while also providing an aggressive exhaust note in Sport and Sport+ modes.

Can the exhaust system be modified or upgraded?

Yes, the exhaust system can be upgraded with aftermarket performance exhausts or BMW M Performance parts. However, modifications may void the vehicle's warranty and should be performed by certified professionals to ensure compatibility and safety.

What is the recommended maintenance schedule for the exhaust system?

BMW recommends inspecting the exhaust system every 10,000 miles or during routine service intervals. Check for leaks, corrosion, and proper mounting. Replace worn components, such as gaskets or hangers, as needed to maintain optimal performance.

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 850i Exhaust System Technical Guide

Coming Soon

Detailed technical specifications and diagrams for the exhaust system, including part numbers and installation instructions.

BMW M Performance Exhaust Upgrade

Coming Soon

Information on upgrading to the BMW M Performance exhaust system, including benefits, installation process, and warranty considerations.

Exhaust System Maintenance Best Practices

Coming Soon

A guide to maintaining the exhaust system, including inspection tips, common issues, and replacement procedures.

BMW Genuine Parts Catalog

Coming Soon

Access the official BMW parts catalog to find genuine exhaust components and related parts for the 850i.

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