BMW 440i 2017-present Exhaust Specifications
Detailed technical specifications for the 2017-Present BMW 440i exhaust system, including components, materials, torque values, and installation guidelines. Ideal for technicians and enthusiasts.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2017-Present BMW 440i, including key features, measurements, and technical details. This guide covers the exhaust system's design, components, and performance specifications to ensure proper maintenance and understanding.
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 documentation by selecting the relevant section from the table of contents. Each section is organized by major components and their respective subsections.
Key Specifications
Exhaust Pipe Diameter
60 mm (2.36 in)
Catalytic Converter Temp
400°C to 800°C (752°F to 1472°F)
Muffler Weight
12 kg (26.5 lbs)
Resonator Length
400 mm (15.75 in)
Tailpipe Diameter
90 mm (3.54 in)
Available Specifications
Exhaust System Overview
This section provides an overview of the BMW 440i's exhaust system, including its design, materials, and key components.
Exhaust System Overview
This section provides an overview of the BMW 440i's exhaust system, including its design, materials, and key components.
System Design
- Dual exhaust system with twin tailpipes
- Stainless steel construction for durability and corrosion resistance
- Optimized for the B58 3.0L inline-6 turbocharged engine
- Integrated catalytic converters for emissions compliance
- Active exhaust valve for enhanced sound control
Key Components
- Primary catalytic converter located near the exhaust manifold
- Secondary catalytic converter positioned downstream
- Resonator and muffler for noise reduction
- Exhaust tips with chrome finish for aesthetic appeal
- Oxygen sensors integrated for precise emissions monitoring
Note: The active exhaust valve adjusts based on driving mode (Comfort, Sport, or Sport+).
Exhaust Pipe Specifications
Detailed specifications for the exhaust pipes, including dimensions, materials, and routing.
Exhaust Pipe Specifications
Detailed specifications for the exhaust pipes, including dimensions, materials, and routing.
Pipe Dimensions
- Primary pipe diameter: 60 mm (2.36 in)
- Secondary pipe diameter: 50 mm (1.97 in)
- Tailpipe diameter: 90 mm (3.54 in)
- Total system length: Approximately 3.2 meters (10.5 ft)
- Wall thickness: 1.5 mm (0.059 in)
Routing and Layout
- Exhaust pipes routed beneath the vehicle chassis
- Heat shields installed to protect underbody components
- Flexible joints to accommodate engine movement
- Downpipe connects turbocharger to the catalytic converter
- Rear section splits into dual tailpipes
Catalytic Converters
Technical details about the catalytic converters, including their role, specifications, and maintenance.
Catalytic Converters
Technical details about the catalytic converters, including their role, specifications, and maintenance.
Primary Catalytic Converter
- Located directly after the exhaust manifold
- Ceramic substrate with precious metal coating
- Operating temperature range: 400°C to 800°C (752°F to 1472°F)
- Designed for Euro 6 emissions standards
- Replacement interval: Typically 160,000 km (100,000 mi)
Secondary Catalytic Converter
- Positioned downstream of the primary converter
- Additional reduction of harmful emissions
- Honeycomb structure for increased surface area
- Integrated with oxygen sensors for feedback control
- Maintenance-free under normal operating conditions
Note: Ensure proper engine tuning to avoid damage to the catalytic converters.
Muffler and Resonator
Details about the muffler and resonator, including their design, materials, and performance characteristics.
Muffler and Resonator
Details about the muffler and resonator, including their design, materials, and performance characteristics.
Muffler Design
- Chambered design for effective noise reduction
- Stainless steel construction with internal baffles
- Weight: Approximately 12 kg (26.5 lbs)
- Integrated active exhaust valve for sound tuning
- Dual exhaust tips with chrome finish
Resonator Function
- Positioned between the catalytic converter and muffler
- Reduces specific frequencies of exhaust noise
- Straight-through perforated tube design
- Length: 400 mm (15.75 in)
- Diameter: 100 mm (3.94 in)
Note: The resonator is critical for achieving the desired exhaust note.
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Component Specifications
General Specifications
- Material
- Stainless Steel
- System Type
- Dual Exhaust with Twin Tailpipes
- Emission Standard
- Euro 6
- Part Number
- 18307650001
- Weight
- 22.5 kg
Exhaust Manifold
- Material
- Cast Iron
- Part Number
- 11627586921
- Bolt Torque
- 25 Nm
- Gasket Material
- Graphite
- Heat Shield Material
- Aluminum
Catalytic Converter
- Type
- Three-Way Catalytic Converter
- Part Number
- 18307558894
- Substrate Material
- Ceramic
- Precious Metals
-
- Platinum
- Palladium
- Rhodium
- Operating Temperature
- 400-800 °C
- Efficiency
- >95%
Resonator
- Material
- Stainless Steel
- Part Number
- 18307650002
- Diameter
- 80 mm
- Length
- 450 mm
- Function
- Noise reduction and exhaust flow optimization
Muffler
- Material
- Stainless Steel
- Part Number
- 18307650003
- Diameter
- 90 mm
- Length
- 600 mm
- Sound Level
- 72 dB at 3000 RPM
- Design
- Perforated Tube with Sound-Absorbing Material
Tailpipes
- Material
- Chrome-Plated Stainless Steel
- Part Number
- 18307650004
- Diameter
- 80 mm
- Length
- 300 mm
- Finish
- Polished Chrome
- Configuration
- Dual Tailpipes
Oxygen Sensors
- Type
- Wideband Zirconia Sensor
- Part Number
- 11787558021
- Location
-
- Pre-Catalytic Converter
- Post-Catalytic Converter
- Operating Temperature
- -40 to 900 °C
- Response Time
- <100 ms
- Voltage Range
- 0.1-0.9 V
Exhaust Flanges
- Material
- Stainless Steel
- Part Number
- 18307650005
- Bolt Size
- M8
- Bolt Torque
- 30 Nm
- Gasket Material
- Graphite
- Sealing Method
- Metal Ring Gasket
Exhaust Hangers
- Material
- Rubber with Steel Core
- Part Number
- 18307650006
- Quantity
- 4
- Load Capacity
- 15 kg each
- Durability
- Resistant to heat and oil
Exhaust Clamps
- Material
- Stainless Steel
- Part Number
- 18307650007
- Size
- 80-90 mm
- Torque Specification
- 20 Nm
- Application
- Securing exhaust joints
Operational Parameters
- Max Exhaust Gas Temperature
- 950 °C
- Back Pressure Limit
- 0.3 bar
- Flow Rate
- 450 CFM
- Vibration Tolerance
- ±2 mm
- Noise Limit
- 74 dB at full load
Maintenance Specifications
- inspection Interval
- Every 30,000 miles
- Cleaning Requirements
- Remove carbon deposits every 60,000 miles
- Gasket Replacement interval
- Every 100,000 miles
- Torque Check interval
- Every 15,000 miles
- Corrosion Protection
- Apply high-temperature paint as needed
Diagnostic Specifications
- Oxygen Sensor Diagnosis
- Check voltage and response time
- Catalytic Converter Efficiency Test
- Use OBD-II scanner
- Exhaust Leak Detection
- Visual inspection and smoke test
- Back Pressure Measurement
- Use pressure gauge
- Noise Level Test
- Use decibel meter at 3000 RPM
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks and damage
- Check oxygen sensor functionality
- Verify exhaust hanger integrity
Ensure all bolts are torqued to specification
- Inspect catalytic converter for efficiency
- Check exhaust flanges and gaskets
- Clean oxygen sensors if necessary
Replace gaskets if signs of wear are present
- Perform full exhaust system inspection
- Replace oxygen sensors if required
- Check and clean resonator and muffler internals
Ensure all components are free of excessive carbon buildup
- Replace catalytic converter if efficiency drops below 90%
- Inspect and replace exhaust hangers if necessary
- Check and replace exhaust clamps
Consider replacing the entire exhaust system if significant corrosion is detected
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the diameter of the exhaust pipes on the 2017-Present BMW 440i?
What is the diameter of the exhaust pipes on the 2017-Present BMW 440i?
The exhaust pipes on the 2017-Present BMW 440i have a diameter of 80mm (3.15 inches) for the dual tailpipes. This design ensures optimal exhaust flow and performance.
Q2 Does the BMW 440i exhaust system include a valve-controlled exhaust?
Does the BMW 440i exhaust system include a valve-controlled exhaust?
Yes, the BMW 440i is equipped with a valve-controlled exhaust system. This system adjusts the exhaust flow based on driving conditions, enhancing performance and sound dynamics. The valves open at higher RPMs for a sportier exhaust note.
Q3 What material is used in the BMW 440i exhaust system?
What material is used in the BMW 440i exhaust system?
The BMW 440i exhaust system is constructed from high-quality stainless steel, which provides excellent corrosion resistance and durability. The muffler and tailpipes are also heat-resistant to withstand high temperatures.
Q4 Can the BMW 440i exhaust system be upgraded for better performance?
Can the BMW 440i exhaust system be upgraded for better performance?
Yes, the BMW 440i exhaust system can be upgraded with aftermarket performance exhausts. However, it is recommended to use BMW-approved or genuine parts to maintain warranty coverage and ensure compatibility with the vehicle's ECU and emissions systems.
Q5 What is the backpressure specification for the BMW 440i exhaust system?
What is the backpressure specification for the BMW 440i exhaust system?
The backpressure for the BMW 440i exhaust system is designed to be within the range of 0.5 to 1.2 psi under normal operating conditions. This ensures efficient exhaust gas evacuation and optimal engine 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 440i Exhaust System Technical Guide
Coming SoonA detailed guide covering the specifications, maintenance, and troubleshooting of the BMW 440i exhaust system.
BMW Genuine Exhaust Parts Catalog
Coming SoonOfficial catalog of genuine BMW exhaust components for the 440i, including part numbers and installation instructions.
BMW 440i Exhaust Valve Control System Overview
Coming SoonAn in-depth explanation of the valve-controlled exhaust system, including its operation and benefits.
BMW 440i Exhaust System Maintenance Tips
Coming SoonPractical tips for maintaining the exhaust system, including cleaning, inspection, and common issues.
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