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Old 12-18-2006, 12:00 AM   #1
Alaskan_awd
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Default Emissions, Catted vs. None DP

Hey guys, I want to go stage 2 before spring and I was wondering how many of you have catted or non catted DP's, have or havn't you had any problems with passing inspections, and what brand/type of DP do you have?
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Old 12-18-2006, 12:04 AM   #2
AWDBST
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Go catless. When the time comes swap the stock one back on. It will take like 30 mins every two years.
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Old 12-18-2006, 12:49 AM   #3
prometheum
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gut the stock ones ftw
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Old 12-18-2006, 01:35 AM   #4
Alaskan_awd
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Other then emissions a reason to stick to a catted dp seems to be that the 06's have boost creep problems and getting a catted dp helps prevent it.
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Old 12-18-2006, 02:01 AM   #5
AWDBST
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Get engine management and port your wastegate. Problem solved.
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Old 12-18-2006, 02:37 AM   #6
02redwagone
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Quote:
Originally Posted by prometheum View Post
gut the stock ones ftw
x2 sleeper powah
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Old 12-18-2006, 03:07 AM   #7
Alaskan_awd
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I've been searching like crazy on here and keep coming up with new stuff . I would like to gut the stockers becuase that =$0.00, but from what I have read without 1 cat (and I would like it to be a high flow cat) I will likely get boost creep, yes I will have an AP when I change the DP but that is a bandaid and wont realy fix the problem (from what I have read), and I havnt done any research on it but having the wastegate ported doesnt sound very easy or cheap.

About the boost creep though, here is a quote taken from another post not sure how true it is, but interesting (I have a late model 06) "mostly found on early 06's and 05 sti's as it seems a batch of turbos were miss cast with an improper WG opening. Thats why some get creep and others dont."

So far it looks like the best option is a divorced wg full length catted DP.
The 06 exhaust is also different in the dp and midpipe are one piece, I could get a shorty dp but would have to use a midpipe section from an 02-05 wrx.
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Old 12-18-2006, 03:58 AM   #8
00Maddog
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Quote:
Originally Posted by Alaskan_awd View Post
The 06 exhaust is also different in the dp and midpipe are one piece, I could get a shorty dp but would have to use a midpipe section from an 02-05 wrx.

wrong, they look different buts that's it. all interchangeable. all downpipes are 2 piece, all the same except for 6mt's. all midpipes interchange, just different size resonators. all mufflers interchange. on wrx's anyhow.
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Old 12-18-2006, 01:27 PM   #9
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good thread. dumb question, but what is boost creep? i plan to go stage 2 very soon. i have heard of boost leaks.
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Old 12-18-2006, 01:38 PM   #10
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Originally Posted by MikeyMike View Post
good thread. dumb question, but what is boost creep? i plan to go stage 2 very soon. i have heard of boost leaks.
Everything you wanted to know about boost creep (it is new to me too) http://forums.nasioc.com/forums/showthread.php?t=477715
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Old 12-18-2006, 01:42 PM   #11
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Keep in mind new vehicles are every four years now instead of two.
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Old 12-18-2006, 03:28 PM   #12
ponamy
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Keep in mind new vehicles are every four years now instead of two.
thats 04 and up isnt it?
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Old 12-18-2006, 03:36 PM   #13
Alaskan_awd
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I think its 06 and up, but maybe I missunderstood what he is saying.

Last edited by Alaskan_awd; 12-18-2006 at 03:55 PM.
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Old 12-18-2006, 03:51 PM   #14
Alaskan_awd
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Originally Posted by 00Maddog View Post
wrong, they look different buts that's it. all interchangeable. all downpipes are 2 piece, all the same except for 6mt's. all midpipes interchange, just different size resonators. all mufflers interchange. on wrx's anyhow.

Taken from Unibombers Manifesto

Quote:
I have an 06+ WRX, is the downpipe the same? No. The 2006+ WRX has a unique exhaust in that it's downpipe is both the downpipe and midpipe sections of the "older" exhaust. This means you must use a "long" downpipe to bolt up to the rest of your exhaust system. A full TBE will fit fine, but when replacing just the downpipe, you must use a long downpipe. Check with your Vendor for other possible fitment issues prior to ordering.
Diagram is fo 02-05
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Old 12-18-2006, 04:31 PM   #15
Mavrik
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2004 and newer have a four year extension.
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Old 12-18-2006, 05:03 PM   #16
Alaskan_awd
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2004 and newer have a four year extension.
On the warrenty? I'm confused
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Old 12-18-2006, 05:18 PM   #17
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On the warrenty? I'm confused
on your IM check
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Old 12-18-2006, 05:24 PM   #18
Alaskan_awd
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on your IM check
wow I feal smart.
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Old 12-18-2006, 07:41 PM   #19
MikeyMike
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Quote:
Originally Posted by Alaskan_awd View Post
Everything you wanted to know about boost creep (it is new to me too) http://forums.nasioc.com/forums/showthread.php?t=477715
Wow, thats great. thanks for linking that up. So, i have a slightly lesser chance of boost creep if i get a catted dp?
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Old 12-18-2006, 07:43 PM   #20
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Originally Posted by Mavrik View Post
Keep in mind new vehicles are every four years now instead of two.
Wow, where did you hear this? got it in black and white somewheres?
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Old 12-18-2006, 07:48 PM   #21
Alaskan_awd
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Originally Posted by MikeyMike View Post
Wow, thats great. thanks for linking that up. So, i have a slightly lesser chance of boost creep if i get a catted dp?
It looks like it, at a loss of a few HP though.
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Old 12-18-2006, 08:21 PM   #22
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Wow, where did you hear this? got it in black and white somewheres?
Its been in writing for quite some time Mike, you might be able to get a copy from the DMV or something. I had an "un-offical" print out from office staff here about a year ago when it took effect.
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Old 12-18-2006, 09:51 PM   #23
MikeyMike
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Well im sure its good news to all of us
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Old 12-26-2006, 04:01 AM   #24
Alaskan_awd
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Bump, if I was to gut 1 stock cat, would that be enough flow for stage 2? If so, which should I gut, the first or last cat? Would there be any down falls to gutting one of the stock cats other then less flow, as apposed to getting a high-flow catted DP?
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Old 12-26-2006, 04:10 AM   #25
EvolvedAK
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Well im sure its good news to all of us
were so bad...were the cause of global warming
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