Bosal calls it the "WRX sedan straight pipe" on it's website, but the pipe is far from straight. Other vendor sites have better descriptions for it.
Second Half of Downpipe: Attaches to Bosal's primary downpipe (part number 999-392) or the factory downpipe and eliminates the 2nd catylitic converter on your WRX/STi.
Also known as a 3CE (third cat eliminator), 3rd cat delete, midpipe, race pipe, or test pipe in various WRX/STI forums.
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