Invidia HS15SWMDOCB Catted J-Pipe with High Flow Cat 2015-2021 Subaru WRX 2.0L

Vehicle Fitment

• 2015-2021 Subaru WRX 2.0L FA20DIT Turbo Boxer (VA, 6-Speed Manual Only)

Fitment Notes

• Manual transmission (6MT) only -- does not fit CVT models
• Does not fit 2015-2021 WRX STI (EJ257 engine, different downpipe)
• Does not fit 2022+ WRX (VB chassis)
• Bolts to any Invidia cat-back or factory cat-back exhaust
• Twin O2 bungs -- factory sensor + extra bung for aftermarket wideband
• ECU tune required for safe operation and power optimization
• Not CARB legal -- not for sale or street use in CA

Features

• Invidia J-pipe / downpipe with lower-mounted high-flow catalytic converter
• SUS304 polished stainless steel construction
• 76mm (2.99") piping diameter -- significant flow increase over stock
• 300 CPSI high-flow catalytic converter
• Divorced wastegate design -- separator plate reduces turbulence
• Laser-cut cast steel turbo flange for high-temp durability
• One-piece design replaces factory downpipe and catalytic converter
• Bolt-on installation

Specifications

• Type: J-Pipe / Turbo Downpipe with High-Flow Cat
• Piping Diameter: 76mm (2.99")
• Piping Material: SUS304 Stainless Steel
• Catalytic Converter: 300 CPSI High-Flow
• Cat Position: Lower-Mounted
• Wastegate Design: Divorced (Separator Plate)
• O2 Bungs: Twin (Factory + Aftermarket Wideband)
• Turbo Flange: Laser-Cut Cast Steel
• Installation: Bolt-On
• CARB Legal: No

Included Components

• 1x Invidia J-pipe with integrated high-flow catalytic converter
• 1x Mounting hardware and gaskets

Product Description

The Invidia HS15SWMDOCB is a high-flow catted J-pipe (downpipe) for the 2015-2021 Subaru WRX equipped with the 2.0L FA20DIT turbocharged boxer engine and 6-speed manual transmission. The factory downpipe is the most restrictive component in the WRX exhaust system, and this Invidia replacement uses a larger 76mm (2.99") SUS304 stainless steel pipe with smooth bends that allow the turbocharger to exhale exhaust gases with far fewer restrictions and turbulence -- delivering a substantial bump in both horsepower and torque with a great reduction in turbo lag. The divorced wastegate design features a separator plate between the turbine and wastegate exhaust streams to further reduce turbulence and improve flow.

A 300 CPSI high-flow catalytic converter is integrated in the lower-mounted position to control emissions for street driving while maintaining minimal impact on exhaust flow. The turbo flange is laser-cut from cast steel to withstand the extreme temperatures at the turbocharger outlet, ensuring long-lasting, leak-free reliability. Twin O2 sensor bungs accommodate the factory oxygen sensor and an additional bung for an aftermarket wideband sensor. The one-piece design replaces the factory downpipe and catalytic converter and bolts directly to any Invidia cat-back exhaust system or the stock cat-back with no modification. An ECU tune is required for safe operation and to optimize the power gains from this downpipe. Not CARB legal -- not for sale or street use in California or states adopting California emission standards.