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Catted headers vs un-catted

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Old 02-27-2010, 07:12 AM
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Default Catted headers vs un-catted

I hear theres a good hp increase from going with uncatted headers vs catted

Right now im running catted 1 7/8 kooks, and I hear I could squeeze out at least a extra 10 hp just from getting rid of the cats.

My other mods are in my sig.

What do you guys think?
Old 02-27-2010, 08:19 AM
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10 hp
I seriously doubt it......
Old 02-27-2010, 09:16 AM
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On a street car I would keep the cats, not worth the trouble for a few hp. Cats also can make the exhaust sound better. There are a number of threads where people put the cats back on to get rid of rasp.
Old 02-27-2010, 05:16 PM
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Originally Posted by massls1guy
On a street car I would keep the cats, not worth the trouble for a few hp. Cats also can make the exhaust sound better. There are a number of threads where people put the cats back on to get rid of rasp.
+1 on that. An with cats you won't have any gas smell or at least not nearly as much as you would without cats.
Old 02-27-2010, 05:22 PM
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I've had the same headers with cats and without, the exhaust note of the un-catted is much louder. However if you have to deal with emissions just go with the catted versions, you won't notice a power difference. +1 on the horrible smell without cats, it blows ***.
Old 02-27-2010, 07:09 PM
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cats perform very well. i dynoed the same hp and tq numbers with and without an ory
Old 02-27-2010, 08:17 PM
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To much rasp w/o cats generally, and the exhaust smell is a dead give away. My uncle originally went catless, and within 2 wks, was catted. lol
Old 02-27-2010, 09:09 PM
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Originally Posted by HumanNipple
+1 on the horrible smell without cats, it blows ***.
With all due respect, I think it smells delicious. Reminds me i'm not driving a smart car
Old 02-27-2010, 10:22 PM
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I tested a 500hp engine with and without Dyatech cats, there was a 3-4hp difference. Keep the cats..
Old 02-27-2010, 11:06 PM
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Originally Posted by aothepresident
With all due respect, I think it smells delicious. Reminds me i'm not driving a smart car
I couldn't agree more... plus you lose a little weight, have 2 less O2 sensors to replace, and can get some money back on the cats... emissions are over rated!
Old 02-28-2010, 06:46 AM
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Last 3 cars i have owned have been catless! love it
Old 02-28-2010, 09:07 AM
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I have been an EPA National Emission Compliance Investigator for 6 years, we are currently investigating and charging all non-compliant registered passenger vehicles (Owners) in the Continental U.S.

As a fellow car enthusiast this is a very hard job, but it is the Law.
Old 02-28-2010, 09:16 AM
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Originally Posted by Giddswat
I have been an EPA National Emission Compliance Investigator for 6 years, we are currently investigating and charging all non-compliant registered passenger vehicles (Owners) in the Continental U.S.

As a fellow car enthusiast this is a very hard job, but it is the Law.
And how does one go about this search? Look through ls1tech threads?
Old 02-28-2010, 09:34 AM
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Yes Sir! The only problem with my investigation is that I would have to charge myself.

Just messing around. I knew it wouldn`t take long for someone to jump on that reply. No cats here and the smell is not to bad unless the car is running in the garage, then your eyes will melt.

Winter and cabin fever are driving me nuts, just having a little fun.
Old 02-28-2010, 09:38 AM
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i feel like i've been rickrolled or something
Old 02-28-2010, 09:52 AM
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Ha if he actually took the time to track me down on here.. then somehow find my car which isn't even stored at my house and to do an emissions test in a state that doesn't require I would allow you to fine me just for attempting the impossible..
Old 02-28-2010, 10:25 AM
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Originally Posted by aothepresident
With all due respect, I think it smells delicious. Reminds me i'm not driving a smart car

I dont know about that, my mom's smart smell and uses diesel
Old 02-28-2010, 10:32 AM
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I dont realy have to worry about emissions, the smell might bother me alittle but the people behind me will ahte me more.

If it would only gain 3-4hp I guess ill just leave them on.
Old 02-28-2010, 11:01 AM
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Originally Posted by Lambert695
Ha if he actually took the time to track me down on here.. then somehow find my car which isn't even stored at my house and to do an emissions test in a state that doesn't require I would allow you to fine me just for attempting the impossible..
Trust me , you can relax. I'm no investigator for anybody, but I might be an instigator sometimes. Just having a little fun.
Old 02-28-2010, 11:07 AM
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Definately not 10 hp..your looking at maybe a few


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