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Old 12-05-2012, 11:43 AM   #26
coldmm803
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looks good. +1 for high flow cat
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Old 12-05-2012, 12:34 PM   #27
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Just bought a used COBB catted version. I'd ditch it for this if it was catted. Especially coated.
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Old 12-05-2012, 01:54 PM   #28
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Quote:
Originally Posted by JazzyJake View Post
If it was available with a cat and was priced competitively with others like Invidia, (a bit higher is fine as it's obviously a nicer pipe, but within reason,) I'd be hard pressed not to snag one.
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Originally Posted by djdalaney View Post
For anyone who cares, GS said they are currently working on another version with a high flow cat. That + ceramic coating = best downpipe on the market.
It's in the works according to GS.
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Old 12-05-2012, 04:44 PM   #29
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they can coat anything and its crazy so many people looking for cats. 5 years ago no one cared. just an observation on that is all.
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Old 12-05-2012, 04:47 PM   #30
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The 2.5 liter motors need a catted pipe to help against boost creep.
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Old 12-05-2012, 04:55 PM   #31
03WRXWagon
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Quote:
Originally Posted by vision.dynamix View Post
The 2.5 liter motors need a catted pipe to help against boost creep.

I have no Cat, a Dom 2.5 xtr, a 2.5 liter and 0 boost creep?
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Old 12-05-2012, 04:56 PM   #32
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Quote:
Originally Posted by meat_WRX View Post
they can coat anything and its crazy so many people looking for cats. 5 years ago no one cared. just an observation on that is all.
Minimal gains and a lot more noise are the only things catless is going to provide. Not to mention in California, having no cat is just asking the officer next to you at the light to pull you over and possibly impound your car...

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Originally Posted by 03WRXWagon View Post
I have no Cat, a Dom 2.5 xtr, a 2.5 liter and 0 boost creep?
He probably meant on the stock turbo.
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Old 12-05-2012, 04:58 PM   #33
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a tune prevents boost creep? And yea i know why people need cats but the interest has grown so much over the past few years.
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Old 12-05-2012, 05:05 PM   #34
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Originally Posted by meat_WRX View Post
a tune prevents boost creep? And yea i know why people need cats but the interest has grown so much over the past few years.
Their girlfriends got sick of the un-catalyzed exhaust fumes
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Old 12-05-2012, 05:07 PM   #35
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I have to agree. Years ago, everyone wanted a "test pipe." That was the only way to go. Maybe the concerns for the atmosphere are striking a cord somewhere. The gains are definitely worth mentioning when looking at the two, but at what expense? Oh well. Really nice looking pipe. I just can't justify the price, personally, but super nice piece.
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Old 12-05-2012, 05:08 PM   #36
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damn that thing is so pretty.
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Old 12-05-2012, 05:18 PM   #37
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Quote:
Originally Posted by djdalaney View Post
Their girlfriends got sick of the un-catalyzed exhaust fumes
do you know me? lol
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Old 12-05-2012, 05:30 PM   #38
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Quote:
Originally Posted by meat_WRX View Post
a tune prevents boost creep? And yea i know why people need cats but the interest has grown so much over the past few years.
I meant on the stock turbo. A tune can help but won't eliminate the problem. It's a mechanical problem.
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Old 12-05-2012, 06:20 PM   #39
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Did GS close the group buy with zero participants?!

The thread is locked, with no buyers listed. That's crazy. I guess the uncatted thing was a deal breaker for most people. Usually their products get snatched up like crazy. This really surprised me.
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Old 12-05-2012, 06:48 PM   #40
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Quote:
Originally Posted by vision.dynamix View Post
I meant on the stock turbo. A tune can help but won't eliminate the problem. It's a mechanical problem.
Sorry, not a thread about boost creep but I think I have seen some of the top Subaru tuners state that a factory turbo cannot even flow enough air to cause boost creep.

This seems to be a highly debated subject.

Maybe if you push the factory turbo well beyond VE it will creep?

The downpipe looks very nice and if I was in the market, I would rather pay an american company an extra couple $100.

Grimmspeed, will your catless downpipe cause boost creep on a factory turbo with a good tune?

I ran catless with an OTS Cobb Stage 2 with 0 creep.

Last edited by 03WRXWagon; 12-05-2012 at 06:50 PM. Reason: Edited for stage 2 cobb catless causing no boost creep.
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Old 12-05-2012, 06:51 PM   #41
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Boost creep is a function of the wastegate not flowing enough bypassing the turbine wheel.

VF39, VF43, VF48. Wanna know what the only difference in them is? The size of the wastegate.

The added backpressure from a catted pipe helps.
Or you can port the wastegate.
Or you can run EWG.
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Old 12-05-2012, 06:58 PM   #42
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Quote:
Originally Posted by meat_WRX View Post
they can coat anything and its crazy so many people looking for cats. 5 years ago no one cared. just an observation on that is all.
I live in a state that requires yearly emissions testing and inspection even on new cars. Actually had to have it done on my car right after purchase with less than 200 miles on it because I bought it in another state, which is a bit ridiculous but otherwise I don't mind. Catted will still increase power, my butt dyno wont miss the few extra hp when I finally upgrade. If I need more power I'll buy more parts...when $ available.
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Old 12-05-2012, 07:05 PM   #43
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Cut the downpipe and weld in your own high flow cat. That's what I did with a noname bellmouth, with a quality cat. Probably flowed better than any catted version you can purchase.
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Old 12-05-2012, 07:07 PM   #44
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Quote:
Originally Posted by djdalaney View Post
Their girlfriends got sick of the un-catalyzed exhaust fumes

my car has had no cats for 90k miles and the ONLY time i have smelled it was when it is too rich.....and i drive with the windows down all the time

the 'catless fumes' are another myth i think

poor tunes are NOT a myth, unfortunatly
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Old 12-05-2012, 07:09 PM   #45
03WRXWagon
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Quote:
Originally Posted by vision.dynamix View Post
Boost creep is a function of the wastegate not flowing enough bypassing the turbine wheel.

VF39, VF43, VF48. Wanna know what the only difference in them is? The size of the wastegate.

The added backpressure from a catted pipe helps.
Or you can port the wastegate.
Or you can run EWG.
I am interested to see what Grimmspeed has to say. I am 99% I have seen many tuners say that the "creep" that some people see on a factory turbo can be tuned out as it is not real boost creep. I lurk more than post so maybe my memory is flawed.
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Old 12-05-2012, 07:10 PM   #46
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Quote:
Originally Posted by vision.dynamix View Post
Boost creep is a function of the wastegate not flowing enough bypassing the turbine wheel.

VF39, VF43, VF48. Wanna know what the only difference in them is? The size of the wastegate.

The added backpressure from a catted pipe helps.
Or you can port the wastegate.
Or you can run EWG.

boost creep is a mechanical issue where the hotside housing is mal formed and exhaust gasses dont get directed TRROUGH the wg opening

i have cured several 'boost creep' 'issues' with a dremel on the housing

and it had NOTHING WHAT EVER to do with enlarging the wg opening that the flapper covers

the vf39 is the VIsta of ihi turbos.....they sucked all the way around
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Old 12-05-2012, 07:20 PM   #47
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Quote:
Originally Posted by 03WRXWagon View Post
I am interested to see what Grimmspeed has to say. I am 99% I have seen many tuners say that the "creep" that some people see on a factory turbo can be tuned out as it is not real boost creep. I lurk more than post so maybe my memory is flawed.
Most of the time it can be tuned out. ie: Not real boost creep. Like mentioned, real creep is mechanical.
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Old 12-05-2012, 07:40 PM   #48
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Quote:
Originally Posted by Badler View Post
Most of the time it can be tuned out. ie: Not real boost creep. Like mentioned, real creep is mechanical.

yeah...what he said
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Old 12-05-2012, 08:01 PM   #49
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Quote:
Originally Posted by Uncle Scotty View Post

my car has had no cats for 90k miles and the ONLY time i have smelled it was when it is too rich.....and i drive with the windows down all the time

the 'catless fumes' are another myth i think

poor tunes are NOT a myth, unfortunatly
I know that you know your stuff scotty, but that just isn't true. A car with no cats WILL smell and pollute more than one with cats. Especially when you're just sitting at a light or something. That definitely isn't healthy to be breathing in everytime you drive your car either... Because even if you can't smell it, you're constantly inhaling everything that a cat normally gets rid of. Ever driven behind a 60s muscle/pony car?

Quote:
Originally Posted by meat_WRX View Post
do you know me? lol
Maybe



No, I just used to have a GTI with a testpipe and my girlfriend hated it.

Last edited by djdalaney; 12-05-2012 at 08:27 PM.
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Old 12-05-2012, 11:58 PM   #50
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How does this compare to the Cobb downpipe? Better or worse.... Assuming both were catted
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