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Old 08-21-2008, 02:56 PM   #101
viper74656
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Quote:
Originally Posted by JoeSUBARU View Post
Cobb Stage 2 with an Intake? Is that ok? I thought you needed a stock intake.

....Do you need to get a tune when using a DownPipe?
According to Cobb there are 2 intakes you can use with OTS maps, the Cobb intake and the SPT.

And yes, you need tuning when using a downpipe. If you don't you are risking serious engine damage. The 04+ WRX factory ECU/tune just can't handle it.
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Old 08-21-2008, 03:01 PM   #102
JoeSUBARU
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^ Hey thanks viper !!
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Old 09-03-2008, 11:03 AM   #103
pjung1
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Answered all my questions awesome writeup
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Old 09-12-2008, 01:39 PM   #104
BaNaNaS
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which down pipes will bolt up to the stock catback? besides cobb.
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Old 09-12-2008, 02:05 PM   #105
ammo0000
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Most, if not all, will bolt right up.
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Old 09-12-2008, 03:00 PM   #106
ringe
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The COBB works best because it tapers down to use a donut style OEM gasket. Others will sort of work if you use a flat gasket and new bolts to clamp the lip of the catback to the larger diameter aftermarket pipe, but that may not seal as intended. You can find an adapter on Ebay and probably elsewhere...just do a search for 3" to 2.5" adapters.
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Old 12-30-2008, 08:57 PM   #107
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nice review man...this thread is 4 years old! lol
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Old 03-09-2009, 10:48 PM   #108
an09wrx
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Is it ok to reuse the donut gasket?
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Old 03-24-2009, 08:51 PM   #109
ouchMonkey
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thanks again, very helpful.
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Old 03-25-2009, 05:28 PM   #110
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so according to this write-up i dont need em to run catless dp on my 06 sti?!?!? or am i reading ths wrong?

Do I need engine management with a downpipe? For 02/03 WRX and STI users, no. For 04+ WRX users, it's pretty much a requirement as the open loop/closed loop fueling issue mandated by the EPA causes long term reliability problems with using a downpipe and no tuning. For STI users, the STI was the one exception manufacturers are allowed to have, but it's a wise move regardless as the STI and 06+ WRX users have a good chance of boost creep occuring with downpipe use. Tuning can ease this issue, but the cause/effect/cure of boost creep can be researched via this link.
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Old 04-06-2009, 12:25 AM   #111
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helpful info, thanks for taking the time to do this!
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Old 04-09-2009, 01:46 AM   #112
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the real question is,
i have an spt catback would there be any issue if i put this downpipe???


http://cgi.ebay.com/ebaymotors/HKS-E...Q5fAccessories
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Old 04-09-2009, 08:14 AM   #113
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This is not the eBay support forum, ASK THE SELLER!
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Old 04-09-2009, 02:46 PM   #114
chitownrida
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extremely informative. i have total confidence in installing my dp now
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Old 04-15-2009, 02:26 PM   #115
scottsubarus
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Along with CEL light on, cruise control light flashing as well.

resistor installed, codes cleared but light comes back on after a day.

Catless up pipe and Cobb down pipe installed at same time 04 Forester XT Auto



???
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Old 04-15-2009, 03:41 PM   #116
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Quote:
Originally Posted by scottsubarus View Post
Along with CEL light on, cruise control light flashing as well.

resistor installed, codes cleared but light comes back on after a day.

Catless up pipe and Cobb down pipe installed at same time 04 Forester XT Auto



???
If it is possible, it is helpful to post the associated code for the CEL.
Does the Forester XT have a catted-up like the WRX? There could be two different CEL for your car. I don't know your answer, but I have seen a bunch of posts and read the FAQ to know that there is a DP CEL fix and a UP CEL fix (when the OEM UP is catted) and that each of these has their own associated code.

HTH
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Old 04-15-2009, 03:56 PM   #117
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Yes, had catted up pipe from factory

From doing a search on Forums P0420 sounds like the culpret, because others talk about cruise control light flashing as well, but resistor was installed and light came back on.
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Old 04-15-2009, 09:30 PM   #118
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Conermed code P0240.

Will research fixes
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Old 04-15-2009, 09:55 PM   #119
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Legality aside: Cat or catless in terms of performance?

Catless seems to be a lot cheaper in general compared to high flowing cats (which is essentially a win-win for me, as I want performance at a budget).
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Old 04-15-2009, 11:49 PM   #120
1stockwrx
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minimal difference/s if youre on stock turbo

do you have an EM planned ahead?
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Old 04-24-2009, 12:23 PM   #121
ezil71
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For the section in your top post re: legality of downpipes.

No downpipe is ever legal to run on the street, under federal law, because it alters or moves cats. Especially true in CA.

Basically, if you are running stage 2/have replaced your downpipe (or anything before the cat) - you are breaking the law -


Some states seem to ignore the federal law, and allow passing of emissions with at least one cat (or by not doing the visual inspection and/or using the ecu to look for codes only).

As with many things, it is up to you to decide if you want to make a downpipe/emissions mod, as long as you understand you are taking a risk.

I wish Cobb/AP and exhaust vendors would mention this!

Please add something to this effect to the exhaust/engine management f.a.q.'s so that people can at least be informed when they make a choice to mod.

(flame suit on)
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Old 05-18-2009, 02:39 PM   #122
blades04
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Could a stock dp play an issue with boost problems on a WRX with higher miles?
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Old 05-22-2009, 06:04 PM   #123
11rex06
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Question: is the WRX (2.0L) stock downpipe the same as the STi (2.5L) downpipe? GD bodies
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Old 05-22-2009, 06:51 PM   #124
hoffmanEstates
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if i do a ported headers,perrin up and a full 3" TBE how long/far can my 04 last so i could make it to a tune session?
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Old 05-22-2009, 08:24 PM   #125
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Quote:
Originally Posted by hoffmanEstates View Post
if i do a ported headers,perrin up and a full 3" TBE how long/far can my 04 last so i could make it to a tune session?

The header has zero to do with it. You won't see the real gains without tuning, but it won't hurt anything.

The TBE is another story. How far CAN you drive? A long-ass ways, if you're really nice to the car and aren't climbing hills and such. But who here has enough self-control to do that all the time? That's right, nobody. If you're going to put on a downpipe and not tune it, knowing full well that you NEED to, you should expect no sympathy were something to happen. However, if you needed to drive for a few days before the tune and were going to drive like grandma, you'd have no problems.

Suffice to say it's not about time, it's about how you drive it and if you intend to put the stuff on now and wait a while to tune, just to have the parts installed, yoar doing it wrong, and if you're driving in such a way that you can identify some of the gains, you're asking for trouble. You should put them on as close to the time of the tune as possible.
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