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Old 07-18-2006, 03:16 PM   #1
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Default poking a hole thru a cat converter.. good idea?

i recently passed smog in the CA using my friends new cat because my old cat is so old it doesnt pass smog anymore. my question is.. since i passed smog, i will be returning the new cat to my friend.. is it a good idea to poke a hole thru my old cat for more power gains?
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Old 07-18-2006, 03:20 PM   #2
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Default Re: poking a hole thru a cat converter.. good idea? (jdmb18ckid)

if it doesnt pass smog as it sits then why not
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Old 07-18-2006, 03:25 PM   #3
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Default Re: poking a hole thru a cat converter.. good idea? (dohcMONSTER)

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Originally Posted by dohcMONSTER
if it doesnt pass smog as it sits then why not
exactly.. would poking a big hole thru it for more clearance make any performance difference? or will i lose "umph"
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Old 07-18-2006, 03:34 PM   #4
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It will sound like ****. Punch out the inside of the cat sell it to a scrap yard, and then put the gutted cat back on.


Overall its a bad idea but atleast you will make like 30 bucks doing it.
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Old 07-18-2006, 04:53 PM   #5
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Default Re: poking a hole thru a cat converter.. good idea? (jdmb18ckid)

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Originally Posted by jdmb18ckid
exactly.. would poking a big hole thru it for more clearance make any performance difference? or will i lose "umph"
Nothing other then noise will Really be noticeable.
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Old 07-18-2006, 06:09 PM   #6
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Default Re: poking a hole thru a cat converter.. good idea? (FlatBlackTeg)

Why not just buy a hi-flow cat?? Help keep the air cleaner, dont have to deal with noise, and it gives the cops one less reason to medd with you.
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Old 07-18-2006, 06:29 PM   #7
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Default Re: poking a hole thru a cat converter.. good idea? (Racermech)

i wouldnt do this,
however, i know here in PA a lot of vehicles have visual emission testing, so people punch their cats out and then run a piece of pipe through the cat. I've heard that just punching the cat actually doesnt create any gains beause the air then flows into that large open chamber and that creates just as much restriction as having a legit cat. Thats why you'd want to run a piece of pipe through it. Really though.. id just buy a performance cat or a test pipe.

oh yeah.. if you do punch it out, dont breathe that **** in, i hear its really horrible for your lungs, and make sure you dont leave the stuff that comes out of it out where an animal could get at it or anything, try to dispose of it in a safe way.
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Old 07-18-2006, 06:36 PM   #8
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Default Re: poking a hole thru a cat converter.. good idea? (7andaswitchblade)

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Originally Posted by 7andaswitchblade
i wouldnt do this,
however, i know here in PA a lot of vehicles have visual emission testing, so people punch their cats out and then run a piece of pipe through the cat.
FTW!!1
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Old 07-18-2006, 06:40 PM   #9
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Default Re: poking a hole thru a cat converter.. good idea? (FlatBlackTeg)

sigh, another ghetto project by flatblack
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Old 07-18-2006, 06:41 PM   #10
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Default Re: poking a hole thru a cat converter.. good idea? (BOLO-FTW.)

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Originally Posted by BOLO-FTW.
sigh, another ghetto project by flatblack
dude, i r teh master migger, and that **** fits perfect
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Old 07-18-2006, 06:42 PM   #11
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Default Re: poking a hole thru a cat converter.. good idea? (FlatBlackTeg)

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Originally Posted by FlatBlackTeg

dude, i r teh master migger, and that **** fits perfect
ya, i believe u are good at fab work, but buy one real part and show me to make me
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Old 07-18-2006, 07:37 PM   #12
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It created back pressure when ou gut the cat i wouldnt do that. I was also debating sticking a cat shell around a test pipe or soemthing?
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Old 07-18-2006, 08:37 PM   #13
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gutted cat has a buzz tone, its better if a cop looks under your car, but i prefer test pipe...but in CA a ticket with no cat is $3000. friend got caught before so i would stick to your gutted cat if you dont care about the sound. oh yeah and Arizona is the same fine also. $3000 or around there.


Modified by dc2rtek at 10:30 PM 7/18/2006
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Old 07-18-2006, 08:39 PM   #14
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Default Re: poking a hole thru a cat converter.. good idea? (jdmb18ckid)

gut the cat and make it a test pipe by running piping through it, that way it still looks like a cat. That is my plan for the future.
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Old 07-18-2006, 11:33 PM   #15
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Default Re: poking a hole thru a cat converter.. good idea? (mrdeadman)

I heard whenever you "gap" the exhaust pipe, it is bad for the car, because the motor is very hot and then when you turn off the car and let it sit, cool air goes inside the motor and can screw things up since the internals can bend or something from the hot and cold crap, so I thin cutting a hole in the cat is bad.

also dc2rtek, if the cop pulls you over and you have a test pipe it is a 3000$ fine? Holy ****! Also if you have an exhaust pipe, can they fine you for it if it aint over 93 decibals?
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Old 07-19-2006, 12:29 AM   #16
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Default Re: poking a hole thru a cat converter.. good idea? (4drlsintegra)

lol, I did that same thing on my first integra,

But where I live, NO emissions, NO testing
All the counties around me do test thought


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cat, catalytic, cleaner, converter, convertor, exhaust, hole, holes, hondatech, make, pass, pipe, poke, poking, run, smog

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