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Old 04-25-2014, 10:52 PM   #1
yama200
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Default Downpipe sheared off at turbo, what do?

I finally got under my 03 WRX sedan today to inspect what I thought would be a failed exhaust gasket, the car had been louder than anything else on the road for a week or so and I assumed it was just that. Surprise! Looks like my stock downpipe somehow sheared off flush with the bracket which connects to the turbo, almost clean except for one jagged protrusion. It was just barely hanging by the turbo heat shield which kept it from falling directly onto the right cv joint.

I now know that a previous owner must have had an aftermarket DP at some point, the hangers on the DP part look all kinds of fudged up and there's a black wire (02 sensor I presume?) hanging down from above, not even capped off. What's wrong with people and this crap?

Right now I've pulled the entire exhaust and am considering driving it for a week or so until I either salvage a OEM DP or find a good aftermarket replacement.

Can I drive it like this? The heat shield won't bolt back up without the DP and I'm worried about frying/melting the exposed plastic components and CV joint without it. Will the 02 sensor I unplugged at the third cat cause any problems? I won't be driving much, I've already sourced a downpipe from a local wrecked car, should I go for OEM or buy something like Perrin? Will I need a tune with just a catless DP?
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Old 04-26-2014, 01:54 AM   #2
Uncle Scotty
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you really can NOT drive the car without at least a downpipe

no

dont
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Old 04-26-2014, 01:56 AM   #3
Brother EddieJ.
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NO!!! Don't drive it.

Common sense isn't so common
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Old 04-26-2014, 02:54 AM   #4
Shiftace420
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I would suspect that your exhaust does not have enough flex in the hangers and/or you have one or more engine or trans mounts that have an issue. The problem really will just come back with a new downpipe if you do not correct this.

Don't drive it.

Do get it fixed, and defiantly look into your exhaust hangers.

As far as the replacement downpipe I would look into the same pipe you already have. It will be setup for the tune you already have ect ect blah blah blah. Unless you wish to buy a tune with your downpipe just stay with stock.

Good luck, hope you have found the last of the scab work on that car but I doubt it. Give it a very good once or twice over to be sure.

Cheers
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Old 04-26-2014, 09:39 AM   #5
yama200
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Thanks for the advice, I only considered it because I drove the car for a bit while the leak was already there.

If I'm repairing the stock exhaust, does anybody know why the front 02 sensor and exhaust temp sensor was removed by the PO? Should I try to replace these as well?

I've never thrown codes because of it as far as I know, I do have a lingering CEL from misfire which I thought originated from the coilpacks after doing the valve cover gaskets.

Also, because it's a 03, I've heard that a tuneless DP is an option for a while, I'm also pretty DIY, couldn't I re-flash the ECU myself after installing a DP?

As far as resell value, would you guys consider the car more valuable/desirable completely stock (as it would be if I replaced with stock DP) or modded just with a DP?
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Old 04-26-2014, 09:49 AM   #6
codesoccer
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If you're taking about the o2 sensor in the downpipe it's useless in 03 cars and you don't need it. It's not the reflashing that's difficult, you need to find a tuner to make a map for your car.
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Old 04-26-2014, 10:02 AM   #7
yama200
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Unfortunately, because of $$$$$ I'll be doing all the fixing myself, I know for sure that at least one of the exhaust hangers is fubar thanks to the PO, looks like he took an angle grinder to it, what could I do about it anyway?
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Old 04-26-2014, 11:07 AM   #8
Shiftace420
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You know anyone with a welder?
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Old 04-26-2014, 11:50 AM   #9
ogboot
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Put up some pics of that!
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Old 04-26-2014, 12:55 PM   #10
yama200
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http://imgur.com/XPUhjxy

Alternately, could I just get this welded back together today for a short-to-mid term fix?
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Old 04-26-2014, 01:15 PM   #11
PassinThrough
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Wow that's pretty gnarly. Don't see why you couldnt just get it welded back together, as long as it's done well. No front o2 sensor? You want that. Sounds like the previous owner did some weird **** to your car, sorry man. Egt can be removed, do you know if you have an aftermarket uppipe? Or gutted stock?
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Old 04-26-2014, 01:34 PM   #12
yama200
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Thankfully it's just the exhaust that's been fudged, the rest of the car was in pretty good shape actually, I bought it at 80k, it's at 110k now, did timing belt, valve covers, fuel rails and fluids myself and it's worked flawlessly until this. It didn't come with ANY trunk carpet though and the guys I picked it up from had a distinct eastern european gangster flavor to them.
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Old 04-26-2014, 01:45 PM   #13
Shiftace420
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Pretty clean break. Seems that it can be repaired pretty easy.

Might also be able to scrounge up one from someone who bought aftermarket for cheap.
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Old 04-26-2014, 01:52 PM   #14
codesoccer
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Quote:
Originally Posted by PassinThrough View Post
Wow that's pretty gnarly. Don't see why you couldnt just get it welded back together, as long as it's done well. No front o2 sensor? You want that. Sounds like the previous owner did some weird **** to your car, sorry man. Egt can be removed, do you know if you have an aftermarket uppipe? Or gutted stock?
If it's the O2 sensor in the downpipe, he does not need it.
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Old 04-26-2014, 03:31 PM   #15
PassinThrough
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Quote:
Originally Posted by codesoccer View Post

If it's the O2 sensor in the downpipe, he does not need it.
That's true, but;

Quote:
Originally Posted by yama200 View Post

If I'm repairing the stock exhaust, does anybody know why the front 02 sensor and exhaust temp sensor was removed by the PO? Should I try to replace these as well?
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Old 04-26-2014, 03:33 PM   #16
codesoccer
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A lot cheaper to plug the hole than buy a new o2 sensor.
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Old 04-26-2014, 04:11 PM   #17
PassinThrough
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Yeah, then the PO must have deleted the cel since OP says there isn't one for that?

Wouldnt the lack of front o2 sensor make the car run poorly? Especially in boost?
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Old 04-26-2014, 04:15 PM   #18
codesoccer
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Ok I think there might be some confusion here. If it's the O2 sensor in his downpipe it's useless. If it's the main O2 sensor in the exhaust manifold, yes the car would run crappy driving normally. In wide open throttle it wouldn't run crappy though because the car switches to open loop fueling in wot and makes fueling adjustments off of the maf.
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Old 04-26-2014, 05:09 PM   #19
PassinThrough
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Ah yup
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Old 04-26-2014, 05:25 PM   #20
paulpat
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You have an 02-03 wrx. Get a cheap used downpipe. Anything. Get a tactrix cable and delete the CEL's for the rear o2. Toss the rear 02 and EGT probe. Keep the front 02 on.

Without the front 02 you are either running in openloop constantly or really poorly.

No, selling it modded reduces price, even though I would buy it because I would do the same exact things to it. go figure.

you dont really need a tune with the 02-03 wrx but I would do at least a road/e tune for about 200 bucks.
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Old 04-27-2014, 05:27 PM   #21
Wriggly1dog
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Quote:
Originally Posted by yama200 View Post
It didn't come with ANY trunk carpet though and the guys I picked it up from had a distinct eastern european gangster flavor to them.
You might want to pick up some Luminol and check the trunk for blood. I cannot help but wonder how many bodies were disposed of in that car before they sold it to you.
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