Invidia Catted J-Pipe & Downpipe With Wide Band & High Flow Cat – 2015-2021 Subaru WRX (Manual Transmission Only)

Catted J-Pipe and Downpipe with Wideband Bung and High Flow Cat for the 2015-2021 Subaru WRX Manual

The Invidia Catted J-Pipe and Downpipe with Wideband Bung and High Flow Cat for the 2015-2021 Subaru WRX manual transmission is a premium 76mm divorced-wastegate downpipe system for the FA20DIT. Complete post-turbo downpipe replacement with a bottom-mounted high-flow catalyst, divorced bellmouth, and wideband bung. The correct specification for tuned builds.

DETAILS

• 76mm (3-inch) piping
• Divorced wastegate design
• Bottom-mounted high-flow catalytic converter
• Wideband O2 sensor bung
• Additional narrowband O2 bung
• SUS304 polished stainless
• Manual transmission specific routing

The divorced bellmouth design separates the wastegate flow from the main turbine outlet, improving turbocharger efficiency and boost control consistency. The bottom-mounted catalyst positioning reduces heat at the catalyst and keeps the main pipe diameter uncompromised above it. The FA20DIT responds with significant improvements in turbo spool and power delivery, immediately noticeable on stock ECU and dramatically more so with a proper tune.

The wideband bung is the specification detail that matters for tuned builds. If you are tuning the FA20DIT, a wideband sensor is required and the bung location on this pipe is correctly positioned for accurate air-fuel ratio measurement under boost. Manual transmission specific routing, not interchangeable with the CVT variant.

What’s in the Box

• Catted downpipe
• High-flow catalytic converter (integrated)
• Gaskets
• Mounting hardware
• Installation instructions

Why Choose Invidia

Invidia has been manufacturing performance exhaust systems in Japan since 1999, and in that time they have built a reputation that carries real weight in the tuning community. Every system is manufactured using SUS304 stainless steel and mandrel-bent tubing, which eliminates the flow restrictions and weak points that crush-bent alternatives introduce at every corner. Their in-house engineering team designs each application from scratch rather than adapting a generic template, which is why Invidia fitment is consistently tighter than the competition. The result is an exhaust that installs cleanly, seals correctly, and lasts. Invidia backs their products with a quality standard that is visible in the finish, the weld quality, and the hardware, details that reflect over two decades of refining the same core manufacturing process.

The RallySport Take

The Invidia J-pipe/downpipe with wideband bung is the tuner’s downpipe for the 2015-2021 WRX manual. If you are tuning the car, this is the specification you need. Divorced wastegate, bottom-mount catalyst, wideband position, 76mm pipe, the complete foundation for the FA20DIT build. Fits the 2015-2021 Subaru WRX with FA20DIT and 6-speed manual transmission only.

Fitment