Engine/Power - EJ20T (pre-2006 WRX and JDM) There is replacement for displacement, it is forced induction - OEM 2.0 liter turbo engines in the USDM WRX. 90-94 Legacy Turbo EJ22 turbo engines can also be discussed here.

downpipe and exaust ?

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Old 05-07-2008 | 04:19 PM
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downpipe and exaust ?

i just put a cattless downpipe and exaust on my suby and was wondering what problems i may run into i all ready did the o2 fix
Old 05-07-2008 | 04:21 PM
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Well, when you see a CHP roll up behind you and his/her cabin starts glowing in red.. You are being scanned for cats.. Too Late.. Put your head inbetween your legs and pray..
Old 05-07-2008 | 04:24 PM
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boost creep and spikes... your motor isn't tuned for the increased flow.
Old 05-07-2008 | 04:27 PM
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did you keep your stock heatshield? if you do just modify it so that you can cover at least a part of the dp so that popos wont really look at it.

i just got pulled over a week ago they asked me to pop my hood and everything but they didnt notice that i was running catless so i guess im just lucky but yeah just try not to rev up high when running catless

the cons of having that is if you dont have engine management youll get misfiring or boost creep lol so avoid racing if you dont have em and yeah its too loud attracts unwanted attention if you know what i mean.
Old 05-07-2008 | 04:36 PM
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cool thanks its not too loud actually i have heard louder for sure im running the evo 2 so its nice but not to loud and sounds like i need an engine management asap any segestions for what type to get
Old 05-07-2008 | 04:55 PM
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Originally Posted by wrxdude1
cool thanks its not too loud actually i have heard louder for sure im running the evo 2 so its nice but not to loud and sounds like i need an engine management asap any segestions for what type to get
i beleive cobb acessport v2 is the best quick fix and pro tune
Old 05-07-2008 | 04:56 PM
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cobb accessport
Old 05-07-2008 | 05:14 PM
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Even with engine managment, you could very possibly get boost spiking (especially catless).

It's a meachanical issue that I have right now(it sucks).

solutions are returning to stock, add a cat, wastegate porting of your turbo, or EWG(External Waste Gate).

Some pro-tuning can act as a temporary patch.

Last edited by matthepcat; 05-07-2008 at 08:27 PM.
Old 05-07-2008 | 05:51 PM
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yeah or another fix is that you buy a dp with high flow cat in it. i heard it works pretty well to avoid boost creeps
Old 05-07-2008 | 08:25 PM
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:(

Originally Posted by gotrice?
yeah or another fix is that you buy a dp with high flow cat in it. i heard it works pretty well to avoid boost creeps
^^ Have one ^^ still creeps

I think the 2.5L motor just pushes too much air.
Old 05-07-2008 | 08:39 PM
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What is boost creep exactly. I just installed a RS*R downpipe to my RS*R GT2 exhaust, and lately, i can hear the boost from outside and I dont know if its me, but sometimes I can smell a little burning smell, kind of like brake/rubber burning. And what is the waste gate porting? Thanks. PM please.
Old 05-07-2008 | 08:56 PM
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Get a Cobb Accessport as soon as you can to be safe.
Old 05-07-2008 | 11:34 PM
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yeah i heard about boost creep more with the 2.5l than the 2.0l i couldnt really find any thing about the 2.0 look like i might be lookin for a catted down pipe soon cant afford to blow any thing up thanks guys
Old 05-08-2008 | 04:10 PM
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im running daily driven with non cat i think as long as you dont really gun the **** out of your car youll be safe. a friend of mine has a 06 sti we have the same setup but he got his more than a year ago and he didnt have any tune until now but his sti runs ok no weird noises.
Old 05-08-2008 | 06:55 PM
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Originally Posted by Ballz
Well, when you see a CHP roll up behind you and his/her cabin starts glowing in red.. You are being scanned for cats.. Too Late.. Put your head inbetween your legs and pray..
when did they start doing this?



OP you'll be fine. We are lucky with bugeyes they aren't too fussy when you add an exhaust or dp.

If you really want to feel your mods go get it tuned with a basemap or custom tune.

Last edited by 03_Impreza_Al; 05-08-2008 at 06:57 PM.


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