BMW Z4 2018-present

BMW Z4 2018-present Exhaust Specifications

Comprehensive technical specifications for the 2018-Present BMW Z4 exhaust system, including detailed information on components, materials, dimensions, and emission compliance.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2018-Present BMW Z4, 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 (Primary)

60 mm (2.36 in)

Exhaust Pipe Diameter (Secondary)

70 mm (2.76 in)

Catalytic Converter Efficiency

>95% (Primary), >90% (Secondary)

Muffler Weight

12 kg (26.5 lbs)

Tailpipe Diameter

90 mm (3.54 in)

Available Specifications

Exhaust System Overview

This section provides an overview of the BMW Z4's exhaust system, including its design, materials, and key components.

Exhaust System Design

Dual exhaust system with chrome-plated tailpipes
Stainless steel construction for durability and corrosion resistance
Optimized for weight reduction and performance
Integrated catalytic converters for emissions compliance

Key Components

Twin-scroll turbocharger for improved exhaust gas flow
Electronically controlled exhaust flap for sound modulation
High-performance muffler with sound-absorbing materials
Oxygen sensors for precise air-fuel ratio monitoring

Note: The exhaust flap adjusts based on driving mode (Comfort, Sport, Sport+).

Exhaust Pipe Specifications

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

Primary Exhaust Pipe

Diameter: 60 mm (2.36 in)
Material: Stainless steel with heat-resistant coating
Routing: Directs exhaust gases from the engine to the catalytic converter
Wall thickness: 1.5 mm (0.059 in)

Secondary Exhaust Pipe

Diameter: 70 mm (2.76 in)
Material: Stainless steel with heat-resistant coating
Routing: Connects catalytic converter to the muffler
Wall thickness: 1.5 mm (0.059 in)

Catalytic Converter Specifications

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

Primary Catalytic Converter

Type: Ceramic monolith with precious metal coating
Efficiency: >95% reduction in harmful emissions
Placement: Integrated into the exhaust manifold
Operating temperature: 400°C to 800°C (752°F to 1472°F)

Secondary Catalytic Converter

Type: Metallic substrate with precious metal coating
Efficiency: >90% reduction in harmful emissions
Placement: Located downstream of the primary converter
Operating temperature: 300°C to 600°C (572°F to 1112°F)

Note: The secondary converter ensures compliance with Euro 6 emissions standards.

Muffler and Tailpipe Specifications

Details about the muffler and tailpipe design, including dimensions, materials, and performance characteristics.

Muffler Design

Type: Dual-chamber muffler with sound-absorbing materials
Material: Stainless steel with heat-resistant coating
Dimensions: 800 mm x 300 mm x 200 mm (31.5 in x 11.8 in x 7.9 in)
Weight: 12 kg (26.5 lbs)

Tailpipe Design

Diameter: 90 mm (3.54 in)
Material: Chrome-plated stainless steel
Shape: Oval with BMW logo embossing
Placement: Integrated into the rear bumper

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Component Specifications

General Specifications

Material: Stainless steel

System Type: Dual exhaust with dual tailpipes

Emission Standard: Euro 6d-TEMP

Part Number: 18307653789

Weight: 22.5 kg

Exhaust Manifold

Material: Cast iron

Heat Shield Material: Aluminized steel

Bolt Torque: 25 Nm

Gasket Part Number: 11627586945

Connection Type: Flanged

Catalytic Converter

Type: Three-way catalytic converter

Material: Ceramic substrate with platinum-palladium-rhodium coating

Efficiency: >95%

Part Number: 18307546732

Operating Temperature: 400-800°C

Muffler

Type: Twin-chamber muffler

Material: Stainless steel

Dimensions: 800 mm x 300 mm x 200 mm

Part Number: 18307653790

Sound Level: 72 dB at 3000 rpm

Tailpipes

Material: Chrome-plated stainless steel

Diameter: 90 mm

Shape: Oval

Part Number: 18307653791

Finish: High-gloss

Oxygen Sensors

Type: Wideband lambda sensor

Location

Pre-catalytic converter
Post-catalytic converter

Part Number

11787586946
11787586947

Operating Temperature: -40°C to 900°C

Response Time: <100 ms

Exhaust Flaps

Type: Electronically controlled

Actuation: Electric motor

Part Number: 18307653792

Operating Pressure: 0.5-1.5 bar

Control Signal: PWM

Mounting System

Hanger Material: Rubber with steel core

Hanger Part Number: 18307653793

Bolt Torque: 30 Nm

Vibration Damping: 85%

Thermal Management

Heat Shield Material: Aluminized steel

insulation Thickness: 5 mm

Part Number: 18307653794

Max Temperature: 900°C

Diagnostic Specifications

Error Codes

P0420
P0430
P0135
P0141

Diagnostic Tool: BMW ISTA

Sensor Check interval: Every 30,000 miles

Emission Test interval: Every 2 years

Service Information Service

Detailed service requirements and schedules for the exhaust system

30,000 miles

24 months

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

Replace oxygen sensors if error codes are present

60,000 miles

48 months

Inspect and tighten all exhaust mounts
Check exhaust flaps for proper operation
Inspect heat shields for corrosion

Replace rubber hangers if signs of wear are detected

100,000 miles

84 months

Perform full exhaust system inspection
Replace catalytic converter if efficiency drops below 90%
Check and clean tailpipes

Consider replacing the entire exhaust system if significant corrosion is found

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the exhaust system configuration for the 2018-Present BMW Z4?

The 2018-Present BMW Z4 features a dual exhaust system with a single turbocharger for the sDrive30i trim and a twin-turbo setup for the M40i trim. The exhaust system includes stainless steel piping, a catalytic converter, and a muffler with electronically controlled exhaust flaps for optimized sound and performance.

What is the diameter of the exhaust pipes on the BMW Z4?

The exhaust pipes on the BMW Z4 have a diameter of 70mm for the sDrive30i trim and 80mm for the M40i trim. These dimensions ensure optimal exhaust flow and performance for each engine configuration.

Does the BMW Z4 exhaust system include a valve-controlled exhaust?

Yes, the BMW Z4 exhaust system features electronically controlled exhaust flaps. These valves adjust the exhaust flow based on driving conditions, enhancing performance and sound during sporty driving while maintaining comfort during normal operation.

What materials are used in the BMW Z4 exhaust system?

The BMW Z4 exhaust system is constructed from high-quality stainless steel, which provides durability and resistance to corrosion. The muffler and exhaust tips are also made from stainless steel, ensuring longevity and a premium finish.

Can aftermarket exhaust systems void the BMW Z4 warranty?

Installing an aftermarket exhaust system may void the BMW Z4 warranty if it causes damage to the vehicle or related components. BMW recommends using genuine parts or approved aftermarket systems to avoid warranty implications. Always consult your dealer before making modifications.

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 Z4 Exhaust System Technical Guide

Coming Soon

A detailed guide covering the design, components, and maintenance of the BMW Z4 exhaust system.

BMW Genuine Parts Catalog

Coming Soon

Access the official BMW parts catalog to find genuine exhaust components for the Z4.

BMW Z4 Service Manual

Coming Soon

The official service manual for the BMW Z4, including exhaust system repair and maintenance procedures.

BMW Warranty Information

Coming Soon

Learn about BMW's warranty policies and how modifications may affect coverage.

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