Catalytic Converter for Subaru WRX (2015-2021) 2.0L Turbo Rear

Direct-Fit Rear Catalytic Converter for 2015-2021 Subaru WRX (VA)

What it Does: The Direct-Fit Rear Catalytic Converter replaces the degraded secondary factory converter on the 2015-2021 Subaru WRX to clear catalyst efficiency codes like P0420 and restore exhaust flow without modifying factory exhaust geometry.

The Stock Subaru WRX Exhaust Substrate Breakdown

The factory secondary catalytic converter on the VA chassis WRX endures persistent thermal stress from the twin-scroll turbocharged direct-injection setup. Over time, high exhaust gas temperatures and direct-injection combustion byproducts degrade the OEM ceramic monolith washcoat. This causes structural crumbling, internal substrate rattle, restricted exhaust velocity, and recurring P0420 or P0430 diagnostic trouble codes that signal catalyst efficiency failure.

The Engineering Solution

Engineered as a bolt-on replacement, this rear catalytic converter features heavy-duty stainless steel casing and precision-machined flanges to resist rust, oxidation, and heat fatigue. The internal high-flow ceramic honeycomb substrate is coated with an active precious-metal washcoat, efficiently neutralizing HC, CO, and NOx emissions while maintaining factory backpressure levels. Built to OEM physical dimensions, it directly aligns with stock factory hangers, flanges, and sensor bungs—eliminating any need for cutting, welding, or custom pipe bending.

What's Included

• 1 x Rear Catalytic Converter
• Installation Gasket(s)
• Mounting Hardware

Technical Specifications

Compatibility

• 2015 Subaru WRX 2.0L Turbo (Position: Rear)
• 2016 Subaru WRX 2.0L Turbo (Position: Rear)
• 2017 Subaru WRX 2.0L Turbo (Position: Rear)
• 2018 Subaru WRX 2.0L Turbo (Position: Rear)
• 2019 Subaru WRX 2.0L Turbo (Position: Rear)
• 2020 Subaru WRX 2.0L Turbo (Position: Rear)
• 2021 Subaru WRX 2.0L Turbo (Position: Rear)

Frequently Asked Questions & Fitment Warnings

Does this fit the VA WRX?

Yes, this is a direct fit for the 2015-2021 Subaru WRX equipped with the FA20DIT 2.0L Turbo engine. Note: This is the rear converter unit only (the front converter is sold separately) and is EPA compliant for 49 states (not legal for sale or use in California or CARB-adopting states).

Will this clear a catalyst efficiency code like P0420?

Yes, replacing a fouled or failed rear converter restores factory emissions scrub rates and clears catalyst efficiency check-engine codes once the ECU drive cycles are completed.

The Subaru Performance Caliber

Built to handle the aggressive boost dynamics of the turbocharged FA20DIT platform, this replacement catalytic converter restores necessary backpressure equilibrium, clean emissions compliance, and original spool response.