Catalytic Converter for Subaru Crosstrek Impreza (2017-2020) 2.0L

Direct-Fit Catalytic Converter for 2017-2020 Subaru Crosstrek & Impreza (GT/GK)

What it Does: This direct-fit front Y-pipe catalytic converter replaces the factory emissions unit on 2017-2020 Subaru Impreza and 2018-2020 Crosstrek (GT/GK) FB20D 2.0L H4 models to restore gas conversion and clear catalyst efficiency codes.

The Stock Subaru Crosstrek & Impreza Exhaust Failure

On the GT/GK platform equipped with the FB20D 2.0L H4 boxer engine, rapid thermal cycling at both cylinder head exhaust ports subjects the factory Y-pipe converter to intense heat soak and vibration. Unburned fuel from cold starts or misfires overheats the OEM ceramic brick, causing substrate fracture and washcoat degradation. Simultaneously, moisture and road salt corrode factory flange welds, creating exhaust leaks that trigger P0420 or P0430 fault codes.

Common Symptoms of a Failing OEM Catalytic Converter

• Check Engine Light / DTCs: Triggers P0420 or P0430 when downstream O2 sensors detect reduced oxygen storage capacity.
• Internal Substrate Rattle: Fractured ceramic honeycomb pieces vibrate inside the canister during cold idle and deceleration.
• Excessive Exhaust Backpressure: Collapsed catalyst cells restrict flow, hurting throttle response and causing failed emissions inspections.

The Direct-Fit Stainless Catalytic Converter Solution

This two-piece front Y-pipe assembly and connecting pipe features corrosion-resistant stainless steel tubing and heavy-duty factory-style head flanges to prevent warping and rust-through. Inside the shell, a ceramic honeycomb substrate with a precious-metal washcoat restores HC, CO, and NOx conversion without choking exhaust flow. Pre- and post-catalyst oxygen sensor bungs match factory FB20D harness routing, enabling a true bolt-on install with zero cutting or welding.

What's Included

• 1 x Front Y-Pipe Catalytic Converter Assembly
• 1 x Connecting Pipe
• 2 x Head Gasket
• 1 x Ring Seal
• 1 x Flange Gasket
• 1 x U-Bolt Clamp

Technical Specifications

Compatibility

• Subaru Crosstrek 2.0L H4 Boxer (2018, 2019, 2020) — Chassis GT (Excludes Crosstrek Hybrid)
• Subaru Impreza 2.0L H4 Boxer (2017, 2018, 2019, 2020) — Chassis GT/GK (Excludes WRX)

Frequently Asked Questions & Fitment Warnings

Does this fit the GT/GK Crosstrek & Impreza?

Yes. This is a direct fit for 2018-2020 Subaru Crosstrek and 2017-2020 Subaru Impreza models equipped with the FB20D 2.0L H4 engine. Excludes Crosstrek Hybrid and WRX; EPA Federal compliant only and not legal in CA, NY, CO, or ME.

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

Yes. A new converter resolves P0420 and P0430 codes caused by a worn catalyst once upstream leaks or misfires are repaired. Oxygen sensors are not included; transfer your existing sensors or install new units.

Are gaskets and mounting hardware included for installation?

Yes. Head gaskets, ring seal, flange gasket, and a U-bolt clamp are included. Let the exhaust cool, soak seized studs with penetrating oil, and torque all flange fasteners evenly.

The Subaru Precision Standard

Engineered for FB20D ECU precision, this assembly restores CEL-free operation and clean federal emissions compliance. Factory hanger geometry and stainless welds ensure rattle-free durability.