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Old 09-27-2007, 06:59 AM   #26
harrison88
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welcome to stage2
I just went stage2 last week (wow it's fast!)

question about the whistle noises
which downpipes are the loudiest as far as whistleing?
I was a little dissapointed in my ERZ which wasn't as loud as my buddy's turboxs (turbo spool is so loud on that thing)
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Old 09-27-2007, 07:28 AM   #27
RP31
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I'd say TXS is the loudest... Combination of the huge bellmouth and thin metal. I've got an Invidia bellmouth that's loud, but the N1 muffler drowns it out.
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Old 09-27-2007, 01:28 PM   #28
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Quote:
Originally Posted by mbs627 View Post
Nope. Just a downpipe.
no thats false you also need an up pipe if it has a cat. on stage 2 A TURBO CAN SUCK OUT THE CAT AND EAT IT. you need an uppipe also if you dont have one. unless you want to buy a new turbo.
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Old 09-27-2007, 01:39 PM   #29
J. Steinbeck
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I wouldn't go so far as to say the info is false... you CAN do just a downpipe and enjoy the performance benefits of stage two. You are correct though, in that if you want to do right by your turbo, you should lose that cat. It won't so much "suck" out the cat as it will "burn" it out.

If the OP hasn't done the uppipe yet, I doubt it is an immediate danger. I would try to get it done in the not too distant future, though.

Last edited by J. Steinbeck; 09-28-2007 at 08:43 AM. Reason: typo...
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Old 09-27-2007, 01:42 PM   #30
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JonM:
The car's going to get faster over the next week or two.
Stage 2 is nice, you'll never go back to stock now.
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Old 09-27-2007, 01:46 PM   #31
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Stage 2 FTW!!
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Old 09-27-2007, 01:54 PM   #32
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Quote:
Originally Posted by Defiant Autospeed View Post

You are REALLY overreacting. There is no reason other than not getting everything out of it you can power wise that you cant run stage 1. While its not optimum, you can definately run stage 1 with a downpipe. The difference will 99% be performance not safety.
I'm not sure about the 2.0L engine.
But running "stage 1" with a larger aftermarket downpipe on the 2.5L engine will definitely result in over boosting.
Usually, a "stage 1" tune (like the Cobb "stage 1" tune) will try to keep the wastegate shut as long as possible in an attempt to reach target boost faster. Cobb is warning about this in their "stage 1" documentation. Please check it out.
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Old 09-27-2007, 05:26 PM   #33
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Doesn't just a catback smell? Or do I have a leak.
I got the catback and ready to go stage 1.
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Old 09-27-2007, 08:28 PM   #34
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quick quote from the 07 WRX map notes. I don't see it in the 04 map notes.
CAUTION!!! DO NOT RUN ANY Stage1 CALIBRATIONS WITH ANY TYPE OF HIGHER FLOWING
DOWNPIPE OR TURBO-BACK EXHAUST ON YOUR 2007 WRX. THE Stage1 CALIBRATIONPING HAS VERY
HIGH WASTEGATE DUTY CYCLES SETTINGS TO TRY AND BRING BOOST ON AT LOWER RPMS. THESE
SETTINGS WILL INDUCE SEVERE BOOST SPIKING AND WILL OVERSHOOT THE TARGETS CAUSING
BOOST SEARCHING. THESE SPIKES CAN CAUSE ENGINE DAMAGE. IF YOU HAVE A HIGHER FLOWING
DOWNPIPE OR TURBO-BACK EXHAUST SYSTEM ON YOUR 2007 WRX, PLEASE USE THE APPROPRIATE
Stage2, VF39, or FP TD05H-18G CALIBRATIONS.

Last edited by Johnny_W; 09-27-2007 at 08:35 PM.
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Old 09-27-2007, 11:29 PM   #35
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The smell issue will go away when you stop using the asstastic Cobb OTS maps and get a proper, legitimate tune.
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Old 09-27-2007, 11:39 PM   #36
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Quote:
Originally Posted by harrison88 View Post
welcome to stage2
I just went stage2 last week (wow it's fast!)

question about the whistle noises
which downpipes are the loudiest as far as whistleing?
I was a little dissapointed in my ERZ which wasn't as loud as my buddy's turboxs (turbo spool is so loud on that thing)
TXS is loudest exhaust on the market with subbys. Blitz Spec Nur is up there also.

Just run open Downpipe for day Its loads of fun.
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Old 09-28-2007, 12:09 AM   #37
073/800
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I apologize for my noobness...but doesn't the 06-07 sti's come with catless uppipes?
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Old 09-28-2007, 12:13 AM   #38
GRUMPY514
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Quote:
Originally Posted by 073/800 View Post
I apologize for my noobness...but doesn't the 06-07 sti's come with catless uppipes?
Sorry for the bad pic but.




2 Cats.

Next to the stock exhaust is a Helix catless DP.
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Old 09-28-2007, 12:27 AM   #39
J. Steinbeck
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Useful pic, but he was asking about the UPpipe, right?

The downpipe you have in the picture does have two cats, though.

All Sti models have catless uppipes.

Actually... I'm pretty sure ALL 2.5 liter WRXs, Sti or not, have catless uppipes.
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Old 09-28-2007, 01:39 AM   #40
GRUMPY514
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^^^ Ah iam sorry.

Perhaps this picture will help out a bit more then. If it still doesn't, forgive my ignorance.



Or this 1.



=)
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Old 09-28-2007, 08:27 AM   #41
J. Steinbeck
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^^^

That last picture is FUNNY. I'd like to know the details behind that one.

That still isn't an uppipe in your first picture, though.

The uppipe is located in FRONT of the turbo, and serves as a the pipe that takes exhuast from the manifolds to the input of the turbo. A stock uppipe looks like this:




On 2.0 liter 02-05 models, there is a single cat in this pipe. 2.5 liter WRXs have a catless design with a flex section. This is why many recommend gutting or changing out catted uppipes... the increased heat of a stage 2 setup often causes the ceramic cat material to disentigrate, and end up going through the turbo. Bad times.

Last edited by J. Steinbeck; 09-28-2007 at 08:41 AM.
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