Subaru Subaru Legacy 2004-2008 Exhaust Specifications
Explore detailed exhaust system specifications for the 2004-2008 Subaru Legacy, including components like the catalytic converter, muffler, and tailpipe. Ideal for repairs, upgrades, and emissions compliance.
Overview Specifications
This document provides detailed specifications and technical information about the exhaust system for the 2004-2008 Subaru Legacy. It is designed to assist owners, mechanics, and enthusiasts in understanding the components, materials, and performance characteristics of the exhaust system. Use the search and navigation instructions to quickly locate specific details or browse through the sections for a comprehensive overview.
How to Use
Use the search functionality to find specific terms or components within the document. Enter keywords such as 'catalytic converter' or 'muffler' to jump directly to relevant sections.
Navigate through the document by scrolling through the sections or using the table of contents. Each section is organized into subsections with detailed technical points for easy reference.
Key Specifications
Exhaust Pipe Diameter
2.25 inches
Catalytic Converter Efficiency
95% reduction in emissions
Muffler Sound Level
75 dB (factory)
Exhaust System Weight
45 lbs (approx)
Backpressure
1.5 psi (factory)
Available Specifications
Exhaust System Components
This section covers the primary components of the exhaust system, including the exhaust manifold, catalytic converter, muffler, and tailpipe. Learn about the materials used, their functions, and how they contribute to the overall performance of the vehicle.
Exhaust System Components
This section covers the primary components of the exhaust system, including the exhaust manifold, catalytic converter, muffler, and tailpipe. Learn about the materials used, their functions, and how they contribute to the overall performance of the vehicle.
Exhaust Manifold
- Made of cast iron or stainless steel for durability
- Collects exhaust gases from the engine cylinders
- Designed to minimize backpressure
- Includes heat shields to protect surrounding components
Catalytic Converter
- Reduces harmful emissions by converting pollutants
- Contains a ceramic or metallic catalyst substrate
- Oxygen sensors monitor efficiency
- Complies with EPA and CARB regulations
Muffler
- Constructed from aluminized steel for corrosion resistance
- Reduces exhaust noise using sound-dampening chambers
- Includes internal baffles for optimal flow
- Available in performance variants for enhanced sound
Exhaust System Performance
This section focuses on the performance aspects of the exhaust system, including airflow dynamics, backpressure, and sound levels. Understand how the design impacts horsepower, torque, and fuel efficiency.
Exhaust System Performance
This section focuses on the performance aspects of the exhaust system, including airflow dynamics, backpressure, and sound levels. Understand how the design impacts horsepower, torque, and fuel efficiency.
Airflow Dynamics
- Optimized pipe diameter for balanced flow
- Mandrel-bent tubing reduces turbulence
- Designed to complement engine displacement
- Enhances scavenging effect for better efficiency
Backpressure
- Low backpressure design for improved performance
- Balanced with emission control requirements
- Affects engine torque and horsepower
- Performance exhaust systems reduce backpressure further
Sound Levels
- Factory muffler provides quiet operation
- Performance exhausts offer deeper tones
- Sound levels measured in decibels (dB)
- Resonators minimize drone at highway speeds
Maintenance and Upgrades
This section provides guidance on maintaining the exhaust system and explores potential upgrades. Learn about common issues, replacement intervals, and aftermarket options for improved performance.
Maintenance and Upgrades
This section provides guidance on maintaining the exhaust system and explores potential upgrades. Learn about common issues, replacement intervals, and aftermarket options for improved performance.
Maintenance Tips
- Inspect for rust and corrosion regularly
- Check for exhaust leaks at joints and gaskets
- Replace oxygen sensors as recommended
- Clean heat shields to prevent rattling
Common Issues
- Rust due to road salt and moisture
- Cracked exhaust manifolds from thermal stress
- Clogged catalytic converters
- Loose or damaged hangers
Upgrade Options
- High-flow catalytic converters
- Performance mufflers for enhanced sound
- Stainless steel exhaust systems for longevity
- Custom headers for increased power
Search Specifications
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Component Specifications
Overview
- Type
- Dual exhaust system
- Configuration
- Rear-mounted
- Platform
- Subaru Legacy 2004-2008
- Material
- Stainless steel
- Location
- Underbody
Dimensions
- Pipe Diameter
- 2.25 inches (57.15 mm)
- Muffler Length
- 24 inches (609.6 mm)
- Muffler Width
- 8 inches (203.2 mm)
- Muffler Height
- 6 inches (152.4 mm)
- Tailpipe Diameter
- 3 inches (76.2 mm)
- Tailpipe Length
- 18 inches (457.2 mm)
- Overall Length
- 72 inches (1828.8 mm)
Materials
- Exhaust Pipes
- 409 stainless steel
- Muffler Body
- Aluminized steel
- Tailpipe
- 304 stainless steel
- Gaskets
- Graphite and steel composite
- Hangers
- Rubber and steel
Features
- Performance
-
- Optimized flow design
- Reduced backpressure
- Enhanced exhaust scavenging
- Improved horsepower and torque
- Durability
-
- Corrosion-resistant materials
- Heat-resistant coatings
- Reinforced hangers
- Vibration dampening
- Sound Control
-
- Tuned muffler design
- Resonator integration
- Noise reduction technology
- Balanced exhaust note
- installation
-
- Direct bolt-on fitment
- Precision-engineered flanges
- Adjustable hangers
- Comprehensive hardware kit
- Emissions
-
- Compliant with EPA standards
- Oxygen sensor compatibility
- Catalytic converter integration
- Low emissions output
Safety Features
- Heat Management
-
- Heat shields for underbody protection
- Thermal insulation for sensitive components
- Structural integrity
-
- Reinforced welds
- Crash-resistant design
- Emissions Control
-
- Catalytic converter for harmful gas reduction
- Oxygen sensor monitoring
Comfort Features
- Noise Reduction
-
- Quiet cabin operation
- Minimal drone at highway speeds
- Vibration Control
-
- Rubber isolators
- Balanced exhaust flow
- Heat Management
-
- Underbody heat dissipation
- Cooler cabin environment
- Aesthetics
-
- Polished tailpipe finish
- Sleek muffler design
Accessories
- Performance Upgrades
-
- High-flow catalytic converter
- Performance muffler
- Aftermarket exhaust tips
- Maintenance Tools
-
- Exhaust hanger removal tool
- Gasket scraper
- Torque wrench
- Protection
-
- Exhaust wrap
- Heat shield repair kit
- Anti-corrosion spray
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Inspect for leaks or cracks
- Check hangers and mounts
- Clean exhaust tips
- Inspect catalytic converter
- Verify oxygen sensor function
- Maintenance Notes
- Regularly check for rust or corrosion, especially in winter climates.
Warranty
- Standard Warranty
- Miles: 36,000Years: 3Coverage: Defects in materials and workmanship
- Corrosion Warranty
- Miles: 60,000Years: 5Coverage: Perforation due to rust
- Performance Warranty
- Miles: 50,000Years: 4Coverage: Maintains specified flow and sound levels
- Warranty Terms
- Warranty void if modified or used in racing applications.
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Laser-cut components
- Robotic welding
- Pressure testing
- Final assembly
- Quality Control
- inspection Stages: Material integrity checks, Weld strength testing, Flow performance testing, Final visual inspection
- Sustainability Practices
-
- Recycled stainless steel usage
- Eco-friendly coatings
- Waste reduction in production
- Production Metrics
- Units Per Day: 500Defect Rate: Less than 0.5%Energy Efficiency: 15% improvement over previous model
Service Information for exhaust Service
Maintenance and service requirements specific to this component
- Inspect exhaust system for leaks
- Check hangers and mounts for wear
- Clean exhaust tips
- Inspect catalytic converter
- Verify oxygen sensor function
Ensure all connections are tight and free of corrosion.
- Replace exhaust gaskets
- Inspect heat shields
- Check for rust or corrosion
- Test exhaust backpressure
- Inspect resonator and muffler
Use OEM parts for replacements to maintain warranty.
- Replace catalytic converter if needed
- Inspect entire exhaust system for integrity
- Replace oxygen sensors
- Perform emissions test
- Check for exhaust system alignment
Major service may require professional tools and equipment.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Is this exhaust system compatible with all 2004-2008 Subaru Legacy models?
Is this exhaust system compatible with all 2004-2008 Subaru Legacy models?
This exhaust system is designed to be compatible with all 2004-2008 Subaru Legacy models, including both sedan and wagon variants. It fits 2.5L naturally aspirated and turbocharged engines. However, slight modifications may be required for models with aftermarket components or non-standard configurations. Always verify compatibility with your specific trim and engine type before purchase.
Q2 What maintenance is required for the exhaust system?
What maintenance is required for the exhaust system?
Regular maintenance for the exhaust system includes inspecting for rust, cracks, or leaks every 6-12 months. Clean the exhaust tips to prevent buildup and check the hangers and brackets for wear. Replace gaskets and seals as needed during routine servicing. Avoid harsh chemicals when cleaning to preserve the finish and ensure optimal performance.
Q3 How do I install or replace the exhaust system on my 2004-2008 Subaru Legacy?
How do I install or replace the exhaust system on my 2004-2008 Subaru Legacy?
To install or replace the exhaust system, first, lift the vehicle securely using a jack and stands. Remove the old exhaust by detaching the hangers, unbolting the flange connections, and sliding out the system. Install the new exhaust by aligning it with the hangers and bolting the flanges securely. Use new gaskets to prevent leaks and torque bolts to manufacturer specifications.
Q4 What should I do if my exhaust system is making unusual noises?
What should I do if my exhaust system is making unusual noises?
Unusual noises from the exhaust system, such as rattling or hissing, often indicate loose components, leaks, or damaged parts. Inspect the hangers, brackets, and connections for tightness. Check for holes or cracks in the pipes or muffler. If the issue persists, consult a professional mechanic to diagnose and repair the problem.
Q5 How can I optimize the performance of my exhaust system?
How can I optimize the performance of my exhaust system?
To optimize performance, ensure the exhaust system is free of obstructions and leaks. Use high-quality components and consider upgrading to a performance exhaust for better airflow. Regularly inspect and maintain the system to prevent rust and damage. Pair the exhaust with a tuned engine for improved efficiency and power output.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2004-2008 Subaru Legacy Service Manual
Coming SoonComprehensive service manual covering all aspects of maintenance, repair, and troubleshooting for the 2004-2008 Subaru Legacy.
Technical Service Bulletin: Exhaust System Updates
Coming SoonDetails updates and fixes for common exhaust system issues in 2004-2008 Subaru Legacy models.
Subaru Legacy Exhaust Parts Catalog
Coming SoonCatalog listing all OEM and aftermarket exhaust components for the 2004-2008 Subaru Legacy.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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