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Old 02-05-2008, 01:05 AM   #1
subadrifta06
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Default catted downpipe vs non-catted downpipe?

Hey guys im about to go stage 2 with my wrx. I just need a downpipe now. Im debating on which kind to go with? Catted or non catted. I was leading toward the catted downpipe. Is there any diffrence in performance between the catted and the non catted? What are the pro's and con's? Any input would be appreciated. Thanks
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Old 02-05-2008, 01:10 AM   #2
nich0lai
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I blew out my cats, so I tried catless for the last week or so, WOW is it stinky!! Going to find a cat to go somewhere in my system, I feel horrible for the people behind me in drive-ins etc. Far as I know you can't feel the difference.

G'luck
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Old 02-05-2008, 01:12 AM   #3
BlackoutWRX
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Catless will screw up your life.


just kidding. I have been catless before. I didnt really mind the smell, I just felt like i was doing harm to my health by breathing all of that in.
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Old 02-05-2008, 01:25 AM   #4
EP191
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I cant tell you from experience but from what ive heard the best idea is to put at least one cat in your exhaust system. The combination of the smell making you want to throw up, terrible air polution, very minimal gains in hp compared to high flow cats, and excessively loud noise will eventually make you wish you went catted. Unless your building a track day car i cant see much benefit from going catless unless your trying to put some charcoal stains on your buddies front bumper while sitting in traffic.

p.s. if your going to drive aggressively with a fast car, you might as well try to sneak under the radar as much as possible rather than draw attention to yourself with the 5-O
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Old 02-05-2008, 01:41 AM   #5
subysoldier
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i love my catless turbo back, no regrets... I dont think there will be much of a difference in power, but a catted dp will cost more.
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Old 02-05-2008, 02:00 AM   #6
kyosho
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go catted.. the stench of catless is horrible.
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Old 02-05-2008, 02:08 AM   #7
diebel
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what does catless smell like?
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Old 02-05-2008, 03:42 AM   #8
nich0lai
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^^ass and gas.








(better description, kinda like an old tractor, or a super stinky bus)
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Old 02-05-2008, 09:14 AM   #9
LloydChristmas
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Ewwwww Puke in my mouth
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Old 02-05-2008, 09:22 AM   #10
jyi
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Aren't there boost creep issues when going catless?

I know a good tune could fix anything but besides the stench, are there any other known problems?
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Old 02-05-2008, 09:25 AM   #11
Bluestreak2006
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I love the smell of my catless. Kinda of a cinamon gas smell. Its really just preference and cost. I looked for cheaper catted downpipe but were constantly on back order.


I personally don't have creep/spike issues. But it is known to happen. Something to do with the TD04 is too small and the 2.5 pushes more are than the wastegate can handle.

Last edited by Bluestreak2006; 02-05-2008 at 09:27 AM. Reason: edit
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Old 02-05-2008, 09:36 AM   #12
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Quote:
Originally Posted by diebel View Post
what does catless smell like?
a '60/'70 era muscle car...
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Old 02-05-2008, 09:37 AM   #13
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Quote:
Originally Posted by nich0lai View Post
^^ass and gas.
All I have to say is
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Old 02-05-2008, 09:37 AM   #14
jyi
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Quote:
Originally Posted by Bluestreak2006 View Post
I love the smell of my catless. Kinda of a cinamon gas smell. Its really just preference and cost. I looked for cheaper catted downpipe but were constantly on back order.


I personally don't have creep/spike issues. But it is known to happen. Something to do with the TD04 is too small and the 2.5 pushes more are than the wastegate can handle.

What EM are u using and how soon did you get a tune after you went catless?
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Old 02-05-2008, 10:19 AM   #15
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Going catless is a personal preference, just like exhaust noise. Some people like driving loud ass cars that smell like exhaust, others like to be low key and keep their cars more comfortable for passengers and everyday driving.

There is little performance difference between a catless DP and a DP with a high flow cat.
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Old 02-05-2008, 10:34 AM   #16
Bluestreak2006
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Quote:
Originally Posted by jyi View Post
What EM are u using and how soon did you get a tune after you went catless?
Just the cobb OTS 93 ontane map.

5 minutes after the install. The time it takes a V1 accessport to reflash....

Last edited by Bluestreak2006; 02-05-2008 at 10:34 AM. Reason: edit
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Old 02-05-2008, 10:51 AM   #17
camshaft06
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I would say catted, but the catted DP will cost a bit more than a catless.
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Old 02-05-2008, 10:58 AM   #18
gaugeof12
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Quote:
Originally Posted by Bluestreak2006 View Post
I love the smell of my catless. Kinda of a cinamon gas smell. Its really just preference and cost. I looked for cheaper catted downpipe but were constantly on back order.


I personally don't have creep/spike issues. But it is known to happen. Something to do with the TD04 is too small and the 2.5 pushes more are than the wastegate can handle.
As far as I know it has very little to do with the actual turbo. From reading the TSB from Cobb it appears to have more to do with the stock restrictor pill than the turbo.

http://www.cobbtuning.com/info/?ID=3476
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Old 02-05-2008, 04:10 PM   #19
nhat
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i miss being catless only for the smell. you guys who don't like it aren't real motorheads

i kid. that's the only thing i miss about being catless, but i like to do what i can for the environment so i'm not catless and i can't tell any difference.
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