Catalytic Converter for Subaru Impreza (2006-2007) 2.5L Front

Direct-Fit Front Catalytic Converter for 2006-2007 Subaru Impreza (GD/GG)

What it Does: The Direct-Fit Front Catalytic Converter replaces the degraded factory manifold assembly on 2006-2007 Subaru Impreza 2.5L models to restore proper exhaust scavenging and eliminate P0420 catalytic efficiency trouble codes.

The Stock Subaru Impreza Catalytic Substrate Degradation

Factory exhaust manifolds on naturally aspirated GD/GG series Imprezas endure extreme thermal cycling due to their unequal-length boxer routing. Over extended mileage, the original ceramic matrix breaks down, creating restricted flow channels, unmetered pre-cat exhaust leaks at the pressed flange joints, and persistent check engine lights. This thermal fatigue increases backpressure against the cylinder heads, raising exhaust gas temperatures and choking mid-range torque.

The Engineering Solution

Constructed with durable tubular stainless steel, this replacement assembly resists high-heat oxidation and stress cracking. The core houses a high-efficiency ceramic substrate loaded with precious metal washcoats to ensure optimal emissions reduction without impeding exhaust velocity. Featuring precision-cut, heavy-gauge mounting flanges and integrated O2 sensor bungs, it mounts directly to the cylinder exhaust ports for an airtight seal that withstands constant engine vibration.

What's Included

• 1 × Direct-Fit Front Catalytic Converter Manifold Assembly
• Installation Hardware and Gasket Accessories

Technical Specifications

Compatibility

• 2006-2007 Subaru Impreza 2.5i Sedan 2.5L (GD)
• 2006-2007 Subaru Impreza 2.5i Wagon 2.5L (GG)
• 2006 Subaru Impreza Outback Sport Wagon 2.5L (GG)

Frequently Asked Questions & Fitment Warnings

Does this fit the GD/GG Impreza?

Yes, this is a direct fit for the 2006-2007 Subaru Impreza equipped with the naturally aspirated EJ253 engine. This component does not fit turbocharged WRX or STI models (EJ255/EJ257) and is not legal for sale or use in California, New York, Colorado, or Maine emissions applications.

Are new oxygen sensor ports provided in factory locations?

Yes, this assembly features precision-welded O2 sensor bungs positioned in factory locations to retain proper air-fuel feedback without extending sensor wiring.

The Subaru Performance Standard

Preserve your boxer engine's signature exhaust note, smooth power delivery, and emissions integrity with robust stainless construction designed to handle daily commuter abuse and high-RPM heat cycling.