Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

STi downpipe

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Old Oct 5, 2003 | 09:15 AM
  #1  
dashiet's Avatar
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STi downpipe

hi i am looking for a downpipe, and i want to know what everybody would reccoment. Also which one throws a CEL. I have been looking at a helix downpipe but i dont know how great it is . thanks
Old Oct 14, 2003 | 12:13 AM
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Car Info: 1993/2000/2001 GF4 mostly red
Any downpipe that has a high-flow catalytic converter and an 02 sensor port should not throw a CEL. I would not recommend getting the STi downpipe due to its horrible flange design and small piping. That part was clearly designed by Subaru to be inexpensive to manufacture rather than be conducive to horsepower.
Old Nov 5, 2003 | 01:15 PM
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Dont buy HKS, dosnt help your wastegate at all.

Nick
Old Nov 6, 2003 | 03:48 PM
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From: Kaneohe, HI
Car Info: 2004 STi
Any input on the Invidia DP for use on the STi.

I only ask because I purchased one for my WRX and when I got to the Subaru dealer to get a new DP gasket before I installed it, I left with an STi LOL.

I currently have an HKS cat back on the STi(also from WRX), and am hesitating in completing the TBE with the DP.
Old Nov 7, 2003 | 12:27 AM
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Shopping for STi downpipes is pretty much the same as WRX downpipes. The STi DP isn't really any better.
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