BMW 335i 2005-2011 Exhaust Specifications
Detailed technical specifications and documentation for the exhaust system of the 2005-2011 BMW 335I. Includes OEM part numbers, torque values, and installation guidelines for exhaust manifolds, catalytic converters, mufflers, and oxygen sensors.
Overview Specifications
Comprehensive description of the exhaust specifications for the 2005-2011 BMW 335I, including key features, measurements, and technical details. This guide covers the dual exhaust system, catalytic converters, mufflers, and exhaust piping, ensuring accurate maintenance and repair.
How to Use
Use the search function to locate specific exhaust components by entering keywords such as 'catalytic converter,' 'muffler,' or 'exhaust pipe diameter.'
Navigate through the documentation using the table of contents or section headers. Each section is organized by component type and includes detailed technical specifications.
Key Specifications
Exhaust Pipe Diameter
60 mm (2.36 inches)
Catalytic Converter Weight
6.5 kg (14.3 lbs)
Muffler Weight
8.2 kg (18.1 lbs)
Exhaust Tip Diameter
90 mm (3.54 inches)
System Backpressure
0.15 bar (2.18 psi)
Available Specifications
Exhaust System Overview
This section provides an overview of the dual exhaust system, including its layout, components, and key features.
Exhaust System Overview
This section provides an overview of the dual exhaust system, including its layout, components, and key features.
Dual Exhaust Layout
- Dual exhaust system with separate pipes for each bank of the inline-6 engine
- Exhaust pipes are made of stainless steel for durability and corrosion resistance
- System includes two catalytic converters, two mufflers, and connecting pipes
- Exhaust tips are chrome-plated for a polished finish
- Total system length: 4.2 meters (13.8 feet)
Exhaust Pipe Specifications
- Primary pipe diameter: 60 mm (2.36 inches)
- Secondary pipe diameter: 50 mm (1.97 inches)
- Wall thickness: 1.5 mm (0.059 inches)
- Material: 409-grade stainless steel
- Note: Pipes are mandrel-bent for optimal flow efficiency
Note: Ensure proper alignment during installation to avoid leaks or stress on the system.
Catalytic Converters
This section details the catalytic converters, including their design, materials, and performance specifications.
Catalytic Converters
This section details the catalytic converters, including their design, materials, and performance specifications.
Catalytic Converter Design
- Two catalytic converters, one for each exhaust bank
- Honeycomb ceramic substrate with a 400 cells per square inch (cpsi) density
- Coated with platinum, palladium, and rhodium for emissions control
- Operating temperature range: 400°C to 800°C (752°F to 1472°F)
- Weight: 6.5 kg (14.3 lbs) each
Performance Specifications
- Efficiency: Reduces harmful emissions by up to 98%
- Backpressure: 0.15 bar (2.18 psi) at 6000 RPM
- Service life: Approximately 160,000 km (100,000 miles)
- Note: Replace if efficiency drops below 90% or if physical damage is detected
Mufflers and Resonators
This section covers the mufflers and resonators, including their construction, sound-dampening properties, and installation details.
Mufflers and Resonators
This section covers the mufflers and resonators, including their construction, sound-dampening properties, and installation details.
Muffler Construction
- Dual-chamber design for optimal noise reduction
- Material: Aluminized steel with internal fiberglass packing
- Dimensions: 600 mm (23.6 inches) long, 300 mm (11.8 inches) wide, 200 mm (7.87 inches) tall
- Weight: 8.2 kg (18.1 lbs) each
- Note: Designed to minimize backpressure while reducing exhaust noise
Resonator Specifications
- Helmholtz resonator integrated into the exhaust system
- Reduces specific frequency ranges for a smoother exhaust note
- Dimensions: 400 mm (15.75 inches) long, 150 mm (5.91 inches) diameter
- Material: Stainless steel with perforated internal tubing
- Note: Resonator is optional for aftermarket performance upgrades
Exhaust Tips
This section provides details on the exhaust tips, including their design, materials, and installation.
Exhaust Tips
This section provides details on the exhaust tips, including their design, materials, and installation.
Exhaust Tip Design
- Chrome-plated stainless steel for a polished appearance
- Diameter: 90 mm (3.54 inches)
- Length: 150 mm (5.91 inches)
- Slant-cut design for a sporty look
- Note: Tips are welded to the muffler outlet for a secure fit
Installation Details
- Tips are pre-installed at the factory
- Aftermarket tips must match the OEM diameter for proper fitment
- Ensure proper alignment to avoid contact with the bumper
- Note: Use high-temperature adhesive for aftermarket installations
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Component Specifications
General Specifications
- Material
- Stainless steel
- System Type
- Dual exhaust with dual catalytic converters
- Configuration
- Twin-turbo inline-6 (N54/N55 engine)
- Emission Standard
- EU4/US Tier 2 Bin 5
- Part Number
- 18307585273
Exhaust Manifold
- Material
- Cast iron
- Bolt Torque
- 23 Nm
- Gasket Part Number
- 11627548972
- Heat Shield Material
- Aluminized steel
- Heat Shield Part Number
- 11627548973
Catalytic Converters
- Type
- Two-way catalytic converter
- Location
- Close-coupled to exhaust manifold
- Substrate Material
- Ceramic
- Pre Cat Part Number
- 18307585274
- Main Cat Part Number
- 18307585275
- Operating Temperature
- 400-800°C
Exhaust Pipes
- Diameter
- 70 mm
- Material
- Stainless steel
- Flex Pipe Part Number
- 18307585276
- Clamp Part Number
- 18307585277
- Hanger Part Number
- 18307585278
Muffler
- Type
- Dual-chamber muffler
- Material
- Stainless steel
- Part Number
- 18307585279
- inlet Diameter
- 70 mm
- Outlet Diameter
- 90 mm
- Weight
- 12.5 kg
Tailpipes
- Material
- Stainless steel
- Diameter
- 90 mm
- Finish
- Chrome-plated
- Part Number
- 18307585280
- Alignment Tolerance
- ±2 mm
Oxygen Sensors
- Type
- Wideband zirconia sensors
- Pre Cat Sensor Part Number
- 11787548974
- Post Cat Sensor Part Number
- 11787548975
- Operating Temperature
- -40 to 900°C
- Voltage Range
- 0.1-0.9 V
- Replacement interval
- 100,000 miles
Exhaust Flanges
- Material
- Stainless steel
- Bolt Torque
- 25 Nm
- Gasket Part Number
- 18307585281
- Alignment Tolerance
- ±1.5 mm
Heat Shields
- Material
- Aluminized steel
- Thickness
- 1.5 mm
- Part Number
- 18307585282
- Mounting Bolt Torque
- 10 Nm
- Clearance To Exhaust
- 10 mm
Diagnostic Specifications
- Backpressure Limit
- 0.5 bar
- Catalyst Efficiency Threshold
- 95%
- Oxygen Sensor Response Time
- 100 ms
- Exhaust Leak Test Pressure
- 0.3 bar
- Emission Test Limits
- CO: 0.2%HC: 20 ppmNOx: 0.02%
Service Information Service
Detailed service requirements and schedules for the exhaust system
- Inspect exhaust system for leaks and damage
- Check oxygen sensor functionality
- Verify catalytic converter efficiency
Use BMW-approved diagnostic tools for testing
- Replace oxygen sensors if necessary
- Inspect and tighten all exhaust clamps
- Check heat shields for corrosion and damage
Ensure proper torque specifications are followed
- Replace catalytic converters if efficiency drops below 95%
- Inspect and replace exhaust gaskets as needed
- Perform full emission system diagnostic
Use genuine BMW parts for replacements
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What is the diameter of the exhaust pipes on a 2005-2011 BMW 335i?
What is the diameter of the exhaust pipes on a 2005-2011 BMW 335i?
The exhaust pipes on the 2005-2011 BMW 335i have an outer diameter of 60mm (2.36 inches) for the standard exhaust system. Performance or aftermarket systems may vary.
Q2 What type of catalytic converter is used in the 2005-2011 BMW 335i?
What type of catalytic converter is used in the 2005-2011 BMW 335i?
The 2005-2011 BMW 335i is equipped with a dual catalytic converter system, featuring two high-flow metallic substrate catalytic converters integrated into the downpipes. These are designed to meet Euro 4 emissions standards.
Q3 Can I install an aftermarket exhaust system without voiding my warranty?
Can I install an aftermarket exhaust system without voiding my warranty?
Installing an aftermarket exhaust system may void your warranty if it is determined to have caused damage to other components. Always consult your BMW dealership or warranty documentation before making modifications.
Q4 What is the recommended torque specification for exhaust manifold bolts?
What is the recommended torque specification for exhaust manifold bolts?
The exhaust manifold bolts on the 2005-2011 BMW 335i should be torqued to 23 Nm (17 ft-lbs) in a crisscross pattern to ensure even pressure and prevent leaks.
Q5 How often should the exhaust system be inspected?
How often should the exhaust system be inspected?
The exhaust system should be inspected every 30,000 miles or during routine maintenance. Check for rust, cracks, loose connections, and ensure all hangers and mounts are secure.
Q6 What is the material used for the exhaust system on the 2005-2011 BMW 335i?
What is the material used for the exhaust system on the 2005-2011 BMW 335i?
The exhaust system is primarily constructed from stainless steel, which provides durability and resistance to corrosion. The muffler and resonator may also include aluminized steel components.
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 335i Exhaust System Service Manual
Coming SoonOfficial BMW service manual detailing exhaust system removal, installation, and maintenance procedures for the 2005-2011 335i.
Performance Exhaust Upgrade Guide
Coming SoonA comprehensive guide to selecting and installing performance exhaust systems for the BMW 335i, including compatibility and tuning considerations.
Exhaust System Troubleshooting
Coming SoonStep-by-step troubleshooting guide for common exhaust system issues such as leaks, rattles, and reduced performance.
BMW Genuine Parts Catalog
Coming SoonAccess the official BMW parts catalog to find genuine exhaust components for the 2005-2011 335i.
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