Invidia 3in Downpipe to 2.5in Exhaust Adapter

2015-2021 Subaru STI


SKU: HS02SWIAPDWe price match!

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The 3in Downpipe to 2.5in Exhaust Adapter will prevent exhaust leaks in the Subaru STI.
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Invidia 3in Downpipe to 2.5in Exhaust Adapter


  • Durable stainless steel construction
  • Designed to adapt the end of a 3-inch downpipe to the stock or 2.5-inch cat-back exhaust system
  • Optimizes the exhaust flow
  • Eliminates any potential exhaust leaks between the downpipe and cat-back
  • Includes all hardware for the installation



This is the Invidia 3-Inch Downpipe To Stock Cat-Back Exhaust Adapter. This adapter will allow you to adapt the tail-end of a 3-inch downpipe to your stock, or a 2.5-inch cat-back exhaust system. This will ensure a proper mating fitment between the two exhaust components to ensure a proper exhaust flow without any exhaust leaks. 


Check out Invidia's Full Quad Tip Cat-Back:

Invidia R400

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2 customer reviews

Average rating
(based on 2 reviews)
Ease of Installation
Fit / Quality
Overall Satisfaction
  1. Invidia Adapter

    By J February 18, 2023

    Today I installed a catback system on my WRX. During installation, one of the spring bolts snapped in half with relative ease. Luckily for me, the original hardware was able to be used. Overall great adapter but flimsy springs bolts.

  2. Used to put stock exhaust back on

    By 11STi March 22, 2022

    I can’t get the mid pipe for my q300 system, so I had to put my stock exhaust back on. This part allowed me to connect a catted invidia downpipe on to the stock exhaust.

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