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Technical Guide
Universal Catalytic Converters for Professional Exhaust Systems
Universal catalytic converters provide significantly greater installation flexibility than vehicle-specific replacement parts. Instead of fitting only one vehicle model, they can be welded into a wide variety of custom exhaust systems, making them the preferred choice for professional exhaust workshops and fabrication specialists.
Straightflow supplies three main catalytic converter solutions:
- Universal Ceramic Catalytic Converters
- Sport Metallic Catalytic Converters
- Metal Catalytic Substrates
Each product group is designed for different applications while maintaining reliable emissions control and long service life.
Universal Ceramic Catalytic Converters
Ceramic catalytic converters represent the largest part of the Straightflow range. They are designed for universal replacement, exhaust repairs and custom fabrication where reliable emissions reduction and cost-effective performance are required.
Our ceramic catalytic converters are available in multiple diameters, lengths and Euro emission standards, allowing fabricators to select the correct converter for a wide variety of passenger vehicles.
Most ceramic models feature a 400 CPSI substrate, providing excellent filtration efficiency while maintaining efficient exhaust flow.
Sport Metallic Catalytic Converters
Sport catalytic converters are designed for higher-performance applications where improved exhaust flow and increased thermal durability are required. Unlike ceramic converters, metallic substrates feature thinner cell walls, allowing exhaust gases to pass more freely while maintaining effective emissions control.
These catalytic converters are particularly suitable for turbocharged engines, modified vehicles and performance exhaust systems.
Metal Catalytic Substrates
For professional exhaust manufacturers and repair specialists, Straightflow also supplies standalone metallic catalytic substrates. These cores are intended for catalytic converter rebuilding, custom fabrication and specialist repair work.
Metal substrates provide excellent heat resistance, high mechanical strength and improved exhaust flow characteristics, making them suitable for demanding performance applications.
200 CPSI vs 400 CPSI Catalytic Converters
Cell density has a significant influence on both emissions control and exhaust performance.
A 200 CPSI metallic catalyst offers reduced exhaust restriction and is commonly used in sport catalytic converters and performance applications where maximum airflow is important.
A 400 CPSI ceramic catalyst provides higher filtration efficiency while still maintaining excellent exhaust flow. It is the most common choice for universal replacement catalytic converters and many road-going vehicles.
Selecting the correct cell density depends on engine output, emissions requirements and the intended use of the vehicle.
Euro Emission Standards
Straightflow offers catalytic converters suitable for Euro 4, Euro 5 and Euro 6 applications. Selecting the appropriate emission standard helps ensure compatibility with vehicle requirements while reducing harmful pollutants including hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx).
Always verify local legislation before selecting a catalytic converter for road use.
Applications
Straightflow catalytic converters are commonly used for:
- Universal catalytic converter replacement
- Custom exhaust fabrication
- Performance exhaust systems
- Motorsport projects
- Professional exhaust repairs
- Stainless steel exhaust fabrication
- Workshop installations
- Catalytic converter rebuilding
Why Choose Straightflow Catalytic Converters?
Our universal catalytic converters are selected for professional fabrication and repair work, offering reliable performance across a broad range of applications.
- Universal weld-in installation
- High-quality stainless steel construction
- Universal ceramic catalytic converters
- Sport metallic catalytic converters
- Metal catalytic substrates
- Multiple diameters and lengths
- 200 CPSI and 400 CPSI options
- Euro 4, Euro 5 and Euro 6 models
- Excellent exhaust flow
- Fast delivery throughout Europe
Frequently Asked Questions
What is a universal catalytic converter?
A universal catalytic converter is designed to fit a wide variety of vehicles and custom exhaust systems rather than one specific model. It is typically welded into the exhaust system by a professional installer.
What is the difference between ceramic and metallic catalytic converters?
Ceramic catalytic converters are commonly used for standard replacement applications, while metallic catalytic converters provide higher exhaust flow and improved durability for performance vehicles.
What are metal catalytic substrates used for?
Metal catalytic substrates are designed for catalytic converter rebuilding, custom fabrication and specialist repair work.
What does 200 CPSI mean?
200 CPSI refers to the number of cells per square inch inside the catalyst. Lower cell density generally improves exhaust flow and is commonly used in sport catalytic converters.
What does 400 CPSI mean?
400 CPSI provides increased filtration efficiency while maintaining excellent exhaust flow, making it the preferred choice for many universal ceramic catalytic converters.
Can universal catalytic converters be welded?
Yes. Straightflow universal catalytic converters are designed for professional weld-in installation.
Which catalytic converter should I choose?
The correct catalytic converter depends on the required emission standard, exhaust diameter, available installation space and intended vehicle use.
Are these catalytic converters suitable for motorsport?
Sport metallic catalytic converters are designed for high-performance applications. Always verify local regulations regarding road use.
Do you offer different sizes?
Yes. Straightflow supplies catalytic converters in multiple diameters and lengths suitable for a wide variety of fabrication projects.
Do catalytic converters reduce exhaust performance?
A correctly selected catalytic converter provides efficient emissions control while maintaining excellent exhaust flow. Sport metallic catalytic converters are specifically designed to minimise restriction.