Invidia High Flow Catalytic Converter - 2008+ Subaru WRX, 2005-2009 STI, 2002+ Legacy (w/ Extra O2 Bung)

Upgrade your Subaru's exhaust flow with the Invidia high flow catalytic converter. Featuring improved flow characteristics, reduced backpressure, and an extra O2 bung for tuning flexibility, this high-quality cat delivers proven power gains while maintaining emissions compliance. The premium construction ensures long-term reliability for street and track use.

Key Features:

• High flow catalytic converter design
• Extra O2 sensor bung for tuning flexibility
• Reduced backpressure for improved performance
• Proven horsepower and torque gains
• Emissions compliant (check local regulations)
• Direct bolt-on fitment for Subaru applications
• Premium Invidia quality and construction
• Made in Japan

Performance Benefits:

• Improved Flow: High flow design reduces exhaust backpressure
• Power Gains: Proven horsepower and torque increases throughout RPM range
• Extra O2 Bung: Additional sensor port for wideband tuning or monitoring
• Emissions Compliant: Maintains catalytic converter for emissions compliance
• Direct Fitment: Bolt-on installation using factory mounting points
• Durable Construction: Premium materials ensure long-term reliability

Specifications:

• Brand: Invidia
• Part Number: HS08SW1DOC
• Product: High Flow Catalytic Converter
• Design: High flow cat with extra O2 bung
• Material: Stainless steel
• Weight: 21.2 lbs
• Made in: Japan

Fitment Information:

• Compatible Vehicles:
• 2008-2021 Subaru WRX (all models)
• 2005-2009 Subaru STI
• 2002-2009 Subaru Legacy GT
• Note: Verify fitment for your specific year and model before purchasing

What's Included:

• Invidia high flow catalytic converter
• Gaskets
• Mounting hardware
• Installation instructions

Installation Notes:

• Professional installation recommended
• Direct bolt-on - no cutting or modifications required
• Lift or jack stands required for access
• Professional tuning recommended for optimal performance
• Check local emissions regulations before installation

High Flow Design - Reduced Backpressure:

The Invidia high flow catalytic converter features an optimized internal design that significantly reduces exhaust backpressure compared to the factory cat. The high flow design uses a larger substrate with improved flow characteristics, allowing exhaust gases to pass through more efficiently. This reduction in backpressure results in measurable horsepower and torque gains throughout the RPM range.

Extra O2 Sensor Bung:

The extra O2 sensor bung provides additional flexibility for tuning and monitoring. This additional port can be used for a wideband O2 sensor for precise air/fuel ratio monitoring during tuning, or for additional exhaust gas temperature monitoring. The extra bung is especially useful for turbocharged applications where precise tuning is critical for performance and reliability.

Proven Power Gains:

Invidia's testing shows the high flow cat delivers measurable horsepower and torque gains on WRX and STI applications. The improved exhaust flow reduces backpressure, allowing the engine to breathe better and produce more power. The gains are especially noticeable in the mid-range and top-end where the factory cat becomes most restrictive.

Emissions Compliant:

Unlike catless downpipes, the Invidia high flow cat maintains a catalytic converter for emissions compliance. This makes it legal for street use in many jurisdictions (check your local regulations). The high flow design provides significant performance gains while still reducing harmful emissions, making it the best of both worlds for street-driven performance cars.

Direct Bolt-On Fitment:

The Invidia high flow cat is engineered specifically for Subaru WRX, STI, and Legacy GT applications, providing direct bolt-on fitment using factory mounting points. No cutting, welding, or modifications are required. The cat connects to the factory turbo outlet and midpipe using factory-style flanges for straightforward installation.

Why Invidia?

Invidia has been manufacturing premium exhaust systems for Japanese performance vehicles for over 20 years. Their products are known for combining excellent sound quality, proven power gains, and reliable construction. Every Invidia product is manufactured in Japan to the highest quality standards and tested extensively before release.

Installation Tips:

• Lift vehicle or use jack stands for access
• Spray penetrating oil on exhaust bolts before removal
• Use new gaskets (included) for leak-free installation
• Torque all bolts to specification
• Check for exhaust leaks after installation
• Consider professional tuning to optimize performance

Perfect For:

• WRX/STI owners seeking improved exhaust flow and power gains
• Daily drivers wanting performance without catless emissions
• Turbocharged builds requiring reduced backpressure
• Anyone upgrading from restrictive factory cat
• Builds requiring extra O2 bung for tuning

Perfect For: 2008+ Subaru WRX, 2005-2009 STI, and 2002+ Legacy GT owners seeking high flow catalytic converter with extra O2 bung, proven power gains, and emissions compliance.

Pro Tip: The extra O2 bung is perfect for wideband sensor installation - essential for proper tuning on modified turbo Subarus.

Made in Japan: Premium Invidia quality with stainless steel construction and direct bolt-on fitment.

Upgrade your Subaru exhaust with Invidia high flow cat - reduced backpressure, extra O2 bung, proven power gains, emissions compliant, direct bolt-on, made in Japan.