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To hollow cat., or not?
#257290
03/17/09 05:47 PM
03/17/09 05:47 PM
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Anonymous
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Anonymous
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I have a 94 5.9 V8 in my truck. I think my catalytic converter is clogged, so I kind of want to hollow it out, because its not as loud as I think it should be, and open up. I'm afraid of triggering the O2 sensor or loosing back pressure, therefore losing power. What do you guys think I should do?
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Re: To hollow cat., or not?
[Re: HealthServices]
#257292
03/17/09 06:05 PM
03/17/09 06:05 PM
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Anonymous
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Anonymous
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Its in the garage with no transmission. I already have a custom Magnaflow exhaust from the cat back. I am also running headers. Not saying I want it louder, but my father in law was running the same system with manifolds, and was louder. Anyone else hollow the cat, or replace it with a straight pipe, or aftermarket piece?
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Re: To hollow cat., or not?
#257293
03/17/09 06:08 PM
03/17/09 06:08 PM
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Joined: Jan 2003
Posts: 75,047
U.S.S.A.
JohnRR
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I Win
Joined: Jan 2003
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U.S.S.A.
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Quote:
Its in the garage with no transmission. I already have a custom Magnaflow exhaust from the cat back. I am also running headers. Not saying I want it louder, but my father in law was running the same system with manifolds, and was louder. Anyone else hollow the cat, or replace it with a straight pipe, or aftermarket piece?
Do you have to pass an EMISSIONS TEST ??? You can't just hollow it out . Mopar cats do clog , replace it , get a hi flow cat if you want more flow .
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Re: To hollow cat., or not?
[Re: JohnRR]
#257294
03/17/09 06:31 PM
03/17/09 06:31 PM
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Anonymous
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Re: To hollow cat., or not?
[Re: JohnRR]
#257295
03/17/09 06:35 PM
03/17/09 06:35 PM
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Joined: Jan 2007
Posts: 10,141
A Red State
SNK-EYZ
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I Live Here
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Posts: 10,141
A Red State
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Quote:
Quote:
Its in the garage with no transmission. I already have a custom Magnaflow exhaust from the cat back. I am also running headers. Not saying I want it louder, but my father in law was running the same system with manifolds, and was louder. Anyone else hollow the cat, or replace it with a straight pipe, or aftermarket piece?
Do you have to pass an EMISSIONS TEST ??? You can't just hollow it out . Mopar cats do clog , replace it , get a hi flow cat if you want more flow .
 If you have to deal with emissions, get a high flow cat.
If there's an Oxygen sensor after the cat more than likely it's going to trip a fault code if you eliminate the cat.
Factory Mopar cats are fairly restrictive so any aftermarket cat will probably flow more especially if you get a high flow one. 
If you want it louder you alot of people leave on the cat and get rid of the muffler. It gives you a throaty glass pack like sound, but not as raspy.
Kayse can't keep up at all now. lol
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Re: To hollow cat., or not?
[Re: SNK-EYZ]
#257296
03/17/09 07:03 PM
03/17/09 07:03 PM
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Anonymous
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So getting rid of it all together is no good? Lose hp?
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Re: To hollow cat., or not?
#257297
03/17/09 07:39 PM
03/17/09 07:39 PM
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Joined: Oct 2005
Posts: 9,065
Milwaukee, WI
In_The_Pink
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master
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Posts: 9,065
Milwaukee, WI
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Quote:
So getting rid of it all together is no good? Lose hp?
Replace it with a DynoMax Super Converter or similar and be done with it.
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Re: To hollow cat., or not?
#257298
03/17/09 08:07 PM
03/17/09 08:07 PM
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Joined: Jan 2003
Posts: 17,861
albany ny
05dakota
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I Live Here
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albany ny
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Quote:
So getting rid of it all together is no good? Lose hp?
no cat wont pass NYS inspection.
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Re: To hollow cat., or not?
#257299
03/17/09 08:10 PM
03/17/09 08:10 PM
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Joined: Nov 2007
Posts: 21,831
Kirkland, Washington
Pacnorthcuda
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Too Many Posts
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Kirkland, Washington
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Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
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Re: To hollow cat., or not?
[Re: Pacnorthcuda]
#257300
03/17/09 08:40 PM
03/17/09 08:40 PM
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Joined: Jan 2003
Posts: 75,047
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,047
U.S.S.A.
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Quote:
Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
But if it trips a check engine fault and they connect a machine to the truck like they do in other states that have commiefornia emissions stds , NY is one i think , it will not pass , they see the light it fails .
Or in some states it's a visual , they look under the truck , NO cat , no pass .
but it's good for you to give the answer the OP is FISHING for ...
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Re: To hollow cat., or not?
[Re: JohnRR]
#257301
03/17/09 08:46 PM
03/17/09 08:46 PM
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Joined: Nov 2007
Posts: 21,831
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,831
Kirkland, Washington
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Quote:
Quote:
Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
But if it trips a check engine fault and they connect a machine to the truck like they do in other states that have commiefornia emissions stds , NY is one i think , it will not pass , they see the light it fails .
Or in some states it's a visual , they look under the truck , NO cat , no pass .
but it's good for you to give the answer the OP is FISHING for ...
I am sorry---what part did you or I miss? He said "no emissions on a 94". (????)
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Re: To hollow cat., or not?
[Re: Pacnorthcuda]
#257302
03/17/09 08:53 PM
03/17/09 08:53 PM
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Joined: Oct 2005
Posts: 9,065
Milwaukee, WI
In_The_Pink
master
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master
Joined: Oct 2005
Posts: 9,065
Milwaukee, WI
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Quote:
Quote:
Quote:
Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
But if it trips a check engine fault and they connect a machine to the truck like they do in other states that have commiefornia emissions stds , NY is one i think , it will not pass , they see the light it fails .
Or in some states it's a visual , they look under the truck , NO cat , no pass .
but it's good for you to give the answer the OP is FISHING for ...
I am sorry---what part did you or I miss? He said "no emissions on a 94". (????)
No emissions test for '95 and older in NY state. Still, I suggest you replace it with a high-flow aftermarket cat-con. For $60, your sensors will be happy, you'll be happy, and Mother Earth will be happy. 
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Re: To hollow cat., or not?
[Re: teflon]
#257305
03/17/09 08:57 PM
03/17/09 08:57 PM
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Joined: Nov 2007
Posts: 21,831
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,831
Kirkland, Washington
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Quote:
Metro NYC testing is done with a "sniffer". Upstate is just a visual, if its there physically its ok. Pre '96 does not require NYSVIP to be plugged into vehicle (OBD II only, 96 and later).
Check engine light can not be on.
remove check engine light 
there are ways around 'the man'
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Re: To hollow cat., or not?
[Re: Pacnorthcuda]
#257307
03/17/09 09:06 PM
03/17/09 09:06 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
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master
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Posts: 5,314
Carstairs, Alberta, Canada
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With a 94 it is unlikely that the engine light will come on. I had a 96 full size that the cat had failed completely on(chamber was empty) and no light on. I agree for 60 bucks just replace it. No fear of future emmisions hassels, and better for resale. It won't lose you or gain you any power either way. Modern cats flow quite well. I will ad, I worked on a 03 explorer at work today. It needs cats too. Nearly 1200 cdn for the cats alone. I can see trying tio find a way around that, but not around 60 to 200 bucks
Last edited by dave571; 03/17/09 09:15 PM.
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