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PERRIN Downpipe with Catalyst - 02-14 Subaru WRX/ 04-21 STI (EJ)





  • 304 Stainless Steel Piping
  • 3 inch Piping Diameter throughout
  • TIG Welded
  • Slip Fit Rear (For Expanded Fitments)
  • Divorced Wastegate
  • 2 Oxygen Sensor Bungs (1 for Factory O2 Sensor / 1 for Aftermarket Wideband Gauge Sensor)
  • Smoother Exhaust Flow
  • Increased Horsepower & Torque


  • 1 x Catted Downpipe
  • 1 x Exhaust to mid-pipe Gasket Hardware
  • 1 x Clamp
  • Hardware
  • Does NOT include Turbo to Downpipe Gasket (see sku = 028001)


PERRIN offers this replacement Downpipe for those looking to improve performance on their WRX/STI and are using the vehicle in an off-highway, off-road and/or for competition where the OEM unit won’t suffice.

The PERRIN Performance Catted Downpipe features a divorced wastegate and cat which will separate the exhaust gas exiting the downpipe, creating a smoother exhaust flow, thus resulting in more horsepower and torque. The downpipe is constructed of 304 stainless steel 3-inch mandrel-bent tubing and bolts up to any stock replacement cat-back or stock unit. PERRIN Performance has created a unique design that utilizes a rear slip joint so this downpipe can be used on 2002–2014 WRX / 2004-2021 STI alike! Gone are the days of not having a properly sealed exhaust system, this downpipe will allow you to ensure the proper lengths are had with whatever exhaust system you are using!

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