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

will a cat-back and up-pipe make a TBE or is it cat-back and downpipe?

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Old Dec 28, 2004 | 08:57 PM
  #2  
Steven@Coach's Avatar
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From: Subabrew Crew
Car Info: 2011 WRX Hatchie
TBE is downpipe+catback. And from what I've heard u should port wastegate on the STI if adding a TBE.
Old Dec 29, 2004 | 01:30 AM
  #3  
Kevin M's Avatar
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Car Info: 1993/2000/2001 GF4 mostly red
Originally Posted by Steven@Coach
TBE is downpipe+catback. And from what I've heard u should port wastegate on the STI if adding a TBE.
Usually, though not 100% of the time, the boost cut problem stems from putting catless TBEs on the older '04s with the P17 exhaust housing. It can still happen if you have a cat, or if you have the larger P18 housing (which effectively means your VF39 is a VF34) but it's much less likely. I would verify that you have a P17 before jumping to get your wastegate ported.

More boost creep info

Last edited by Kevin M; Dec 29, 2004 at 01:38 AM.
Old Dec 29, 2004 | 11:33 PM
  #5  
Krinkov's Avatar
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and for those with any confusion TBE stands for Turbo Back Exhaust. Also the stock STI up-pipe is already catless so there is little benefit to running an aftermarket up-pipe
Old Dec 29, 2004 | 11:48 PM
  #6  
awns729's Avatar
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Car Info: want a WRX
you may want to search for 'exhaust diagram'
theres a few threads on it that may help you.
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