Invidia HS15SWMDOC High-Flow Catted Down-pipe for 15-21 Subaru WRX Manual

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)
• Bolts to any Invidia cat-back or factory cat-back exhaust
• 3x O2 bungs -- 2 factory sensors + 1 extra for aftermarket wideband/EGT
• Does not include turbo-to-downpipe gasket (recommended: GrimmSpeed 020033)
• ECU tune required for safe operation and power optimization
• Not CARB legal -- not for sale or street use in CA
• Lower-mounted cat version available: HS15SWMDOCB
• Catless version available: HS15SWMDPO

Features

• Invidia catted J-pipe / downpipe with high-flow catalytic converter
• SUS304 polished stainless steel construction
• 76mm (3") CNC mandrel-bent piping
• High-flow catalytic converter
• Divorced bellmouth design -- large 4" stainless steel bellmouth opening
• Cast stainless steel flanges -- TIG welded
• 3x O2 bungs (2 factory + 1 aftermarket wideband) with plug
• One-piece design replaces factory downpipe and catalytic converter
• Bolt-on installation
• 1-year manufacturer warranty

Specifications

• Type: J-Pipe / Turbo Downpipe with High-Flow Cat
• Piping Diameter: 76mm (3")
• Piping Material: SUS304 Stainless Steel
• Catalytic Converter: High-Flow
• Bellmouth: 4" Divorced Stainless Steel
• Flanges: Laser-Cut Cast Stainless Steel, TIG Welded
• O2 Bungs: 3 (2 Factory + 1 Aftermarket Wideband)
• Installation: Bolt-On
• CARB Legal: No
• Warranty: 1 Year

Included Components

• 1x Invidia catted J-pipe with integrated high-flow catalytic converter
• 1x Exhaust-to-midpipe gasket
• 1x Mounting hardware
• 1x O2 bung plug

Product Description

The Invidia HS15SWMDOC 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 76mm (3-inch) CNC mandrel-bent SUS304 stainless steel pipe with a large 4-inch divorced bellmouth opening that allows the turbocharger to exhale exhaust gases with far fewer restrictions and turbulence -- delivering up to 60+ horsepower gains at the wheels when combined with an Invidia cat-back exhaust and proper ECU tune, as tested by Turbo Magazine. The divorced bellmouth design frees excess gas and reduces turbulence at the turbo outlet for maximum flow.

Cast stainless steel flanges are TIG welded for high-temperature durability and leak-free reliability at the turbocharger outlet. Three O2 sensor bungs are included -- two for the factory oxygen sensors and one additional bung for an afterma