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Old 01-22-2009, 01:57 PM   #1
chico_kj_23
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Default EJ20G Downpipe?

I have had no luck searching so i think i will ask. What down pipes are people running on their ej20g. will the 02+ down pipes work? i assume not but just thought i would ask. thanks!
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Old 01-22-2009, 02:10 PM   #2
bape-ape
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02+ are longer IIRC.
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Old 01-22-2009, 02:31 PM   #3
DSM_Outback
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If you use it with an 02+ exhaust, will work fine.
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Old 01-22-2009, 02:33 PM   #4
chico_kj_23
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awsome, thats the plan!
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Old 01-22-2009, 04:04 PM   #5
azn0boi04
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yeah i have 02 wrx exhaust...all exhaust will fit from 02-07 wrx/sti... except the new 08's...
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Old 04-14-2009, 07:46 PM   #6
zachattack54
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If already had a exhaust system on(not sure of brand came with car, pretty sure its custom) could I run a 02+ downpipe and if it did not line up exactly could I just take it to a muffler shop and get the them to custom fabricate it so it works?

P.s. Sorry to bring this thread back from the dead but I am doing a little build right away and I got a few questions.
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Old 04-14-2009, 09:06 PM   #7
sniper512
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Yes a shop should be able to match them up if they have any skills.
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Old 04-15-2009, 03:21 AM   #8
thad
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I've been using an 02 wrx exhaust with an 05 sti down pipe, and more recently, an aftermarket down pipe for 02 + wrx. this is on a GC (4dr) w/ 96 ej20g, for the most part fitment is ok, but I've noticed occasional contact between the muffler and sway bar.
I noticed that the muffler sits a bit further aft in the GD with the same exhaust.
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Old 04-18-2009, 05:32 AM   #9
elislider
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JDM downpipes are shorter than the usdm ones. so if you use a jdm downpipe youll just have to custom fit the midpipe. or just get a usdm 02+ downpipe.

be careful with ebay stuff too. from what ive seen, all the ebay stuff quality-wise is great but they have weird flange positions so they dont match at all to usdm or jdm parts. so if you want an ebay exhaust, theyre great and cheap (i have one, sounds great) but get the whole turbo-back. if you try and use (for example) the cat-back section of an ebay catback with an invidia downpipe, it will end up about 4 inches short
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Old 04-28-2009, 03:59 PM   #10
clean 93
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I have a rocket rally downpipe and apexi n1 catback on my gc. It fits great and I only had to modify one hanger that was pointing to the right rather than the left. All the other hangers worked fine.
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Old 04-28-2009, 07:02 PM   #11
i_c_the_light
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Get one custom made?
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Old 04-29-2009, 07:53 PM   #12
zachattack54
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Quick question about o2 sensor?

I got a downpipe and 02 sensor is not the right size and not long enough. Could I just go ahead and get a 02+ oxygen sensor or what have you guys been doing? Thank you for the info I am still acquiring knowledge.
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Old 04-30-2009, 02:18 PM   #13
zachattack54
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BUMP!! I need to figure this out. I did some research and it sounds like that guy is the EGT sensor. It is most definietaly not the right size. What should I do I need some help bad and I am searching and searching and I can't really find a answer!!!!!!.
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Old 04-30-2009, 03:31 PM   #14
Rei_Akira
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there should be one egt and one 02 sensor bung on the dp.... did you buy an ebay dp or what did you go with?
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Old 04-30-2009, 03:54 PM   #15
zachattack54
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It is a 3" BBP and my stock one only had the one sensor and so does the new one. But the problem is that they are both different sizes.
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Old 04-30-2009, 06:28 PM   #16
elislider
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for reference: the EGT is a temperature sensor so the ECU can tell if the catalytic converter is getting too hot. for any catless applicaton, there is no EGT. if your car has an EGT stock and you are going catless, then you will want to get a resistor for the egt plug and trick the ecu into thinking it is always the right temp. (search the forum for egt resistor and youll find info about that)

a stock downpipe has 2 sensors: O2 at the top (before the cat) and Temp sensor at the bottom (after the cat). i have an invidia downpipe and the O2 sensor goes way at the very bottom end of the downpipe so i lengthened the wires for the sensor plug. since the stock O2 sensor normally goes right at the top of the dp
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Old 04-30-2009, 06:35 PM   #17
Rei_Akira
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does your Invidia dp have spots for both sensors? and in the case of Zach what would you suggest since he only has one spot in his dp?
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Old 04-30-2009, 10:56 PM   #18
zachattack54
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Well I went to our local subaru shop and We decided on going totally without and the car seems to be running fine with no CEL's. Right now I'm running straight off the downpipe and wow is it loud. I like it a lot though.
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Old 04-30-2009, 11:00 PM   #19
rockcrete
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The only sensor in the downpipe of a JDM is the cat temp sensor - unplug it and don't worry about it.

You will need an O2 block off plug for the O2 fitting on the turbo outlet part of the downpipe.

Just for reference, your O2 is in the header.
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Old 05-01-2009, 01:46 AM   #20
sniper512
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^+2
I have done this as well.
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Old 05-01-2009, 02:24 AM   #21
elislider
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Quote:
Originally Posted by zachattack54 View Post
Well I went to our local subaru shop and We decided on going totally without and the car seems to be running fine with no CEL's. Right now I'm running straight off the downpipe and wow is it loud. I like it a lot though.
ive done that. and agreed, its loud as hell
Quote:
Originally Posted by Rei_Akira View Post
does your Invidia dp have spots for both sensors? and in the case of Zach what would you suggest since he only has one spot in his dp?
my invidia catless bellmouth downpipe has one 1 spot for a sensor and its for the O2 sensor down by the very end of the downpipe.
Quote:
Originally Posted by rockcrete View Post
The only sensor in the downpipe of a JDM is the cat temp sensor - unplug it and don't worry about it.

You will need an O2 block off plug for the O2 fitting on the turbo outlet part of the downpipe.

Just for reference, your O2 is in the header.
My engine is a jdm v3 sti (ej20k). it has no sensors in the uppipe and 2 sensors in the downpipe, 1 is the O2 (top before the cat) and 1 is the temp sensor after the cat

i should have clarified earlier. i was referring to my jdm sti downpipe. it has a single catalytic convertor

in this picture, the stock downpipe (jdm v3 sti) looks like the one on the right
in this pic, wrx catless (full downpipe replacement), wrx catless top section only, wrx stock, jdm wrx (and i think usdm lgacy turbo)

Last edited by elislider; 05-01-2009 at 02:32 AM.
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Old 01-15-2010, 12:53 PM   #22
MY2ND04WRX
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OMGHi2U

Is there a piece to make the JDM V3 STI downpipe work on my 04 WRX??
This is what I have and it looks like the JDM V3 STI.



You can see the New pipe is about 4 inches shorter. Any suggestions on what I should do?
Thanks in advance

(You wrote)in this picture, the stock downpipe (jdm v3 sti) looks like the one on the right

[/quote]
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Old 01-16-2010, 04:41 AM   #23
thoughto
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rockcrete, sniper512: There's no harm in just removing the cat temp sensor, no CEL on an EJ20K? Just noticed my aftermarket DP I was going to fit has no hole for it.
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