BMW X3 2017-2021 Exhaust Specifications
Detailed technical specifications and documentation for the 2017-2021 BMW X3 exhaust system. Includes component details, torque specifications, maintenance guidelines, and troubleshooting tips.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2017-2021 BMW X3, including key features, measurements, and technical details
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 document. Each section is labeled with a clear title and includes subsections for detailed information.
Key Specifications
Exhaust Pipe Diameter
2.5 inches
Catalytic Converter Efficiency
98%
Muffler Noise Reduction
25 dB
Maximum Flow Rate
450 CFM
Backpressure at 5000 RPM
1.2 psi
Available Specifications
Exhaust System Components
Detailed description of the major components of the exhaust system, including materials, dimensions, and functionality.
Exhaust System Components
Detailed description of the major components of the exhaust system, including materials, dimensions, and functionality.
Catalytic Converter
- Material: Stainless steel with ceramic honeycomb substrate
- Dimensions: 12.5 inches in length, 5.5 inches in diameter
- Efficiency: Converts up to 98% of harmful emissions
- Operating Temperature: 400°C to 800°C
Muffler
- Material: Aluminized steel with internal baffles
- Dimensions: 24 inches in length, 8 inches in diameter
- Noise Reduction: Reduces exhaust noise by 25 dB
- Weight: 12.5 lbs
Note: The muffler is designed to minimize backpressure while reducing noise.
Exhaust Pipes
- Material: 409-grade stainless steel
- Diameter: 2.5 inches
- Wall Thickness: 1.5 mm
- Corrosion Resistance: Rated for 10+ years under normal conditions
Exhaust System Performance
Technical details about the performance characteristics of the exhaust system, including flow rates, backpressure, and emissions.
Exhaust System Performance
Technical details about the performance characteristics of the exhaust system, including flow rates, backpressure, and emissions.
Flow Rate
- Maximum Flow Rate: 450 CFM (cubic feet per minute)
- Optimal Flow Rate: 350 CFM at 3000 RPM
- Backpressure: 1.2 psi at 5000 RPM
- Pressure Drop: 0.8 psi across the catalytic converter
Emissions Compliance
- Complies with Euro 6 and EPA Tier 3 standards
- CO2 Emissions: 150 g/km
- NOx Emissions: 0.02 g/km
- Particulate Matter: 0.001 g/km
Note: The system includes an oxygen sensor for real-time emissions monitoring.
Exhaust System Maintenance
Guidelines for maintaining the exhaust system, including inspection intervals, common issues, and replacement parts.
Exhaust System Maintenance
Guidelines for maintaining the exhaust system, including inspection intervals, common issues, and replacement parts.
Inspection Intervals
- Visual Inspection: Every 10,000 miles
- Emissions Test: Every 20,000 miles
- Catalytic Converter Check: Every 30,000 miles
- Muffler Inspection: Every 50,000 miles
Common Issues
- Corrosion at pipe joints
- Cracked catalytic converter substrate
- Loose or damaged hangers
- Excessive noise due to baffle wear
Note: Regular inspections can prevent costly repairs by identifying issues early.
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Component Specifications
General Specifications
- Material
- Stainless steel
- System Type
- Dual exhaust with rear muffler
- Emission Standard
- Euro 6 / Tier 3
- Part Number
- 18307608810
- Weight
- 22.5 kg
Exhaust Manifold
- Material
- Cast iron
- Bolt Torque
- 25 Nm + 90°
- Gasket Part Number
- 11627559527
- Heat Shield Material
- Aluminized steel
- Heat Shield Thickness
- 1.5 mm
Catalytic Converter
- Type
- Three-way catalytic converter
- Part Number
- 18307558811
- Substrate Material
- Ceramic
- Cell Density
- 600 cells per square inch
- Operating Temperature
- 400-800°C
- Efficiency
- >95%
Oxygen Sensors
- Upstream Sensor Part Number
- 11787558021
- Downstream Sensor Part Number
- 11787558022
- Operating Voltage
- 0.1-0.9 V
- Response Time
- <100 ms
- Replacement interval
- 100,000 miles
Muffler
- Material
- Stainless steel
- Part Number
- 18307608812
- internal Baffle Type
- Perforated tube with fiberglass packing
- Noise Reduction
- 25 dB
- Mounting Bracket Torque
- 40 Nm
Exhaust Pipes
- Diameter
- 70 mm
- Material
- Stainless steel
- Wall Thickness
- 1.2 mm
- Flex Pipe Part Number
- 18307608813
- Clamp Torque
- 15 Nm
Exhaust Tips
- Material
- Chrome-plated stainless steel
- Diameter
- 90 mm
- Part Number
- 18307608814
- Mounting Bolt Torque
- 10 Nm
Emission Control
- EGR System
- Integrated with exhaust manifold
- DPF Part Number
- 18307558812
- Regeneration Temperature
- 600°C
- Regeneration interval
- 300-500 miles
- NOx Reduction Efficiency
- >90%
Thermal Management
- Heat Shield Material
- Aluminized steel
- Heat Shield Thickness
- 1.5 mm
- Thermal Wrap Material
- Fiberglass
- Thermal Wrap Thickness
- 10 mm
- Underbody Heat Shield Part Number
- 18307608815
Diagnostic Specifications
- OBDII Codes
-
- P0420
- P0430
- P0135
- P0141
- Sensor Resistance Range
- 10-20 ohms
- Exhaust Backpressure Limit
- 0.5 bar
- Leak Test Pressure
- 0.3 bar
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks
- Check oxygen sensor operation
- Inspect catalytic converter for damage
Replace oxygen sensors if fault codes are present
- Inspect and tighten all exhaust clamps
- Check heat shields for corrosion
- Inspect muffler and pipes for rust
Apply anti-seize compound to bolts during reassembly
- Replace oxygen sensors
- Inspect and clean DPF
- Check exhaust backpressure
Perform DPF regeneration if necessary
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the exhaust system configuration for the 2017-2021 BMW X3?
What is the exhaust system configuration for the 2017-2021 BMW X3?
The 2017-2021 BMW X3 features a dual exhaust system with two tailpipes, each measuring 90mm in diameter. The system includes a catalytic converter, muffler, and resonator, designed to optimize exhaust flow and reduce backpressure. The system is constructed from high-grade stainless steel for durability and corrosion resistance.
Q2 What is the recommended maintenance schedule for the exhaust system?
What is the recommended maintenance schedule for the exhaust system?
BMW recommends inspecting the exhaust system every 30,000 miles or 24 months, whichever comes first. Key checks include inspecting for leaks, corrosion, and ensuring all mounting brackets and hangers are secure. Regular maintenance helps prevent issues such as excessive noise, reduced performance, and emissions compliance problems.
Q3 Can I replace the exhaust system with an aftermarket option?
Can I replace the exhaust system with an aftermarket option?
While aftermarket exhaust systems are available, BMW strongly recommends using genuine BMW parts to ensure compatibility, performance, and warranty compliance. Aftermarket systems may void your warranty and could affect emissions compliance, vehicle performance, and safety.
Q4 What are the torque specifications for exhaust system components?
What are the torque specifications for exhaust system components?
The exhaust manifold bolts should be torqued to 23 Nm (17 ft-lbs), while the exhaust flange nuts require a torque of 40 Nm (30 ft-lbs). Always refer to the official BMW service manual for precise specifications, as improper torque can lead to leaks or component failure.
Q5 How do I identify a failing exhaust system?
How do I identify a failing exhaust system?
Common signs of a failing exhaust system include loud or unusual noises (e.g., rattling or hissing), reduced fuel efficiency, a strong smell of exhaust fumes inside the vehicle, and visible rust or damage to the pipes or muffler. If any of these symptoms are present, consult a BMW-certified technician immediately.
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 X3 Exhaust System Service Manual
Coming SoonOfficial BMW service manual detailing exhaust system maintenance, repair procedures, and specifications for the 2017-2021 X3.
Genuine BMW Exhaust Parts Catalog
Coming SoonCatalog of genuine BMW exhaust components, including part numbers, pricing, and compatibility information for the 2017-2021 X3.
Exhaust System Troubleshooting Guide
Coming SoonStep-by-step guide to diagnosing and troubleshooting common exhaust system issues in the 2017-2021 BMW X3.
BMW X3 Emissions Compliance Information
Coming SoonDetailed information on emissions standards, testing procedures, and compliance requirements for the 2017-2021 BMW X3 exhaust system.
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Technical Information
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