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Old 02-10-2013, 11:25 AM   #1
Chaz2.5
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Default Downpipe differences

Sorry for the newbness on this question but after searching I can't get a clear cut answer as the term downpipe varies between people, sites, etc... So, using the diagram below hopefully this will help with clarification. Long story short my mother in law needs a new downpipe. Her car has 160k and she is getting the P0420 CEL. I know there are plenty of used stock downpipes available for purchase but where the issue lies is that she has an automatic and from my knowledge there are differences between the downpipe for the manual 5spd and the 4EAT, something about a curve in one of the pipes Where exactly does the difference lie. In the downpipe or the midpipe? I've ready a downpipe meant for the 4EAT can work on the 5spd but not vice versa. Her car is a 2004. I'm thinking the failing cat is the one in the actual downpipe section (using pic below). If those are the same between the 5spd and 4eat, then she can just replace that one section and be good to go. She just dropped $1500 on timing belt, tune up, water pump, radiator so she doesn't have the $1400 Subaru wants to get a new downpipe. Going aftermarket and getting tuned is out of the question for her btw. Already tried that approach but she doesn't want to.
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Old 02-10-2013, 12:43 PM   #2
jebjkey
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Why do you think you need a new DP?

Just because you get a CAT efficiency code does not necessarily mean that you need a new DP.
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Old 02-10-2013, 12:58 PM   #3
talvai
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Never heard of a difference between auto and manual dp their all the same. That being said how do you know its dp? Could be bad sensor.

Also if your tight on money why do you want to get an aftermarket downpipe, then pay for a tune? Why not just get a oem used dp? Those things for like $100 and no tune required. Just saying, but all dps are the same least for 04 unless its not an impreza
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Old 02-10-2013, 01:00 PM   #4
Chaz2.5
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Quote:
Originally Posted by jebjkey View Post
Why do you think you need a new DP?

Just because you get a CAT efficiency code does not necessarily mean that you need a new DP.
For starters the O2 sensor is new. Plus, at 160K with original downpipe it sounds about right. Unless there could be something else but from my experience the culprit has always been a bad cat or bad O2 sensor.
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Old 02-10-2013, 01:08 PM   #5
Chaz2.5
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Quote:
Originally Posted by talvai View Post
Never heard of a difference between auto and manual dp their all the same. That being said how do you know its dp? Could be bad sensor.

Also if your tight on money why do you want to get an aftermarket downpipe, then pay for a tune? Why not just get a oem used dp? Those things for like $100 and no tune required. Just saying, but all dps are the same least for 04 unless its not an impreza
Sensor is new. From what I have read there is a specific bend in the auto downpipe/midpipe to accomodate something with the auto trans where a downpipe meant for a manual trans won't fit because it won't clear that portion of the transmission.

I know used downpipes are like $100-$200 and I have been looking for used but like I said in the original post is that I have read that there are differences between the two. Not sure if it pertains to only certain years (02-07, 08-present, etc...) The comment about going aftermarket was that even buying an AP + aftermarket DP the cost is $700 compared to $1400, so quite a but cheaper.

44102FE050: Auto
44102FE040: Manual

Last edited by Chaz2.5; 02-10-2013 at 01:22 PM.
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Old 02-10-2013, 05:01 PM   #6
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Pics of MIL's downpipe would help a lot. More than likely the only difference for the auto is the length of the downpipe bracket to the transmission.

I have both the 03 wrx and 04 sti downpipes and the only difference is the bracket welded to the downpipe. The sti with a larger gearbox has a shorter bracket. You can just cut it off if its too long for your auto.

You also want to look for 02-05 downpipes as 06 went to a different design.
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Old 02-10-2013, 08:09 PM   #7
Chaz2.5
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Wish I could get a pic however, I'm in El Paso and she is in Southern Oregon.
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Old 02-11-2013, 10:38 AM   #8
talvai
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Quote:
Originally Posted by Chaz2.5 View Post
Sensor is new. From what I have read there is a specific bend in the auto downpipe/midpipe to accomodate something with the auto trans where a downpipe meant for a manual trans won't fit because it won't clear that portion of the transmission.

I know used downpipes are like $100-$200 and I have been looking for used but like I said in the original post is that I have read that there are differences between the two. Not sure if it pertains to only certain years (02-07, 08-present, etc...) The comment about going aftermarket was that even buying an AP + aftermarket DP the cost is $700 compared to $1400, so quite a but cheaper.

44102FE050: Auto
44102FE040: Manual
No idea on difference. Done dp on 02-07 wrx/sti and even 06/07 forester both auto and manual with both oem and aftermarket dp and they all fit. Never had clearance issues or anything like that. Only difference that I saw was the clip bracket and that isn't a huge deal. Again just my experience though
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Old 02-11-2013, 10:59 AM   #9
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Quote:
Originally Posted by GDR View Post
Pics of MIL's downpipe would help a lot. More than likely the only difference for the auto is the length of the downpipe bracket to the transmission.

I have both the 03 wrx and 04 sti downpipes and the only difference is the bracket welded to the downpipe. The sti with a larger gearbox has a shorter bracket. You can just cut it off if its too long for your auto.

You also want to look for 02-05 downpipes as 06 went to a different design.
If he replaces the FULL DP (both cats), an 06-07 one will still bolt up. If he only repalces the "shorty", first section, yes, he'll have to go 02-05.

Manual or auto DP will work just fine. Only the bracket is defferent, IIRC, which isn't needed.
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Old 02-11-2013, 01:45 PM   #10
jebjkey
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Try asking a company that manufactures an aftermarket DP. Maybe one of them will be willing to help you with your question. Cobb is usually pretty helpful with all things Subaru, give them a try.
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