Catalytic Converter for Subaru Forester (2019-2024) 2.5L

Direct-Fit Stainless Catalytic Converter for 2019-2024 Subaru Forester (SK)

What it Does: This two-piece direct-fit catalytic converter assembly replaces the front Y-pipe and rear catalyst pipe on the 2019-2024 Subaru Forester (SK) equipped with the FB25 2.5L H4 boxer engine to restore exhaust flow and emissions conversion.

The Stock Subaru Forester Catalyst Failure

On the SK chassis equipped with the FB25 2.5L H4 engine, factory converters sit directly downstream of the cylinder heads and endure extreme thermal cycling. Repeated heat soak, road-salt corrosion, and unburned fuel spikes eventually fracture the ceramic substrate or burn away its precious-metal washcoat. Once oxygen storage capacity drops, the ECM logs catalyst efficiency codes like P0420 or P0430, while loose substrate chunks rattle and choke exhaust scavenging.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Illuminated MIL storing P0420 or P0430 catalyst system efficiency below threshold codes.
• Physical/Audible Rattle: Metallic rattling from under the engine bay at idle or deceleration caused by a fractured ceramic substrate.
• Drivability & Emissions Loss: Excessive exhaust backpressure, sluggish throttle response, sulfur odors, and failed federal emissions inspections.

The Direct-Fit Stainless Exhaust Solution

This two-piece replacement bolts directly to the cylinder heads and mid-pipe using factory-style flanges, hangers, and pre- and post-catalyst oxygen sensor bungs with no cutting or welding. Its corrosion-resistant stainless steel housings and tubing withstand road salt and high exhaust gas temperatures without cracking at the welds. Inside, a high-flow ceramic honeycomb substrate coated with precious-metal washcoat efficiently oxidizes HC and CO while reducing NOx to satisfy OBD-II monitors and replace unit 18560.

What's Included

• 1 x Front Y-Pipe Catalytic Converter
• 1 x Rear Catalytic Converter Pipe
• 2 x Head Gasket
• 1 x Ring Seal

Technical Specifications

Compatibility

• 2019-2024 Subaru Forester Base (FB25 2.5L H4)
• 2019-2024 Subaru Forester Premium (FB25 2.5L H4)
• 2019-2024 Subaru Forester Sport (FB25 2.5L H4)
• 2019-2024 Subaru Forester Limited (FB25 2.5L H4)
• 2019-2024 Subaru Forester Touring (FB25 2.5L H4)
• 2019-2024 Subaru Forester Wilderness (FB25 2.5L H4)

Frequently Asked Questions & Fitment Warnings

Does this fit the SK Forester?

Yes. This is a direct fit for the 2019-2024 Subaru Forester equipped with the FB25 2.5L H4 engine. This is an EPA federal converter and is not CARB approved—it is not legal for vehicles registered in California, New York, Colorado, or Maine.

Will this clear P0420/P0430 codes, and are O2 sensors included?

Yes, if the converter is the root cause; O2 sensors are not included. Replacing a degraded catalyst restores oxygen storage capacity and clears P0420/P0430 codes once you transfer or install functional oxygen sensors and confirm there are no exhaust leaks.

Are gaskets and mounting hardware included for installation?

Gaskets are included. The set includes two cylinder head gaskets and one ring seal; soak factory fasteners in penetrating oil beforehand and torque all flange bolts evenly once the exhaust is completely cool.

The Subaru Precision Standard

Engineered to restore factory exhaust scavenging and clean emissions monitoring on your SK Forester, this stainless converter assembly delivers reliable OBD-II compliance without restricting flow. Count on accurate flange geometry and thermal durability to keep your boxer engine running quiet and CEL-free.