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ok so i have a 91 camaro with the dual cat setup. my plan was to but out the old cat and weld a 3bolt flanges onto either side. i would do the same on the existing pipes on either side. couldnt i take a piece of stock pipe and weld flanges to it and put it into where the cats use to be? then when emissions come around unbolt the pipe and bolt the cats back in. anyone ever done this. maybe someone has some pictures or advice on doing this?
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you'll get a lot of crap on here for not having a cat...
i just dropped the cat and bashed out the catalyst with a crowbar and a hammer and put it back in. so now it looks like i have a cat when i really don't. the nice part is that now it acts as a resonator and the exhaust sounds way better. and the cops can't bust you for not having a cat bc they can only do a visual inspection. so as long as it looks like you have one, you're good.
HOWEVER- mine is an 83, so its 26 yrs old and is emissions exempt. you may not pass the emissions test if you are still required to have one. i'd only recommend this on an emissions exempt car.
LG4 305ci 4bbl motor, 2.5" Cherry Bomb Extreme muffler- side exit exhaust, Cragar 15x7 Black D Window wheels (4" backspacing), Cooper Cobra Radial GT tires (P235/60R15), 36mm hollow front sway bar with wonder bar, 24mm rear sway bar, Energy Suspension endlinks and Guldstrand bushings, Edelbrock Elite 4222 air cleaner with K&N filter, FF Dynamics 16" Cyclone electric fan, Flex-a-lite Variable Speed Fan Controller, custom fixed headlight conversion with 5000K HIDs and Silverstar Ultra H7 bulbs, Pilot PL-362W driving lights with Hella 100W H3 bulbs, Deka Intimidator 9A78DT AGM battery
ok so i have a 91 camaro with the dual cat setup. my plan was to but out the old cat and weld a 3bolt flanges onto either side. i would do the same on the existing pipes on either side. couldnt i take a piece of stock pipe and weld flanges to it and put it into where the cats use to be? then when emissions come around unbolt the pipe and bolt the cats back in. anyone ever done this. maybe someone has some pictures or advice on doing this?
Pretty much what you're making is a test pipe.Guys sometimes make a pipe like that to run at the track. I'd check you're local laws they're different everywhere.
you'll get a lot of crap on here for not having a cat...
HOWEVER- mine is an 83, so its 26 yrs old and is emissions exempt. you may not pass the emissions test if you are still required to have one. i'd only recommend this on an emissions exempt car.
But I still don't know why so many on here, get all bent when someone asks "How to." Buttom line here, its YOUR car, and YOUR the one taking a risk braking the law, not me or them!
with Stephen.....I posted the same question a couple of weeks ago. After reading everyone's advice/opinion, I have dicided to with a High flow cat when I'm ready for the change!
HOWEVER- mine is an 83, so its 26 yrs old and is emissions exempt. you may not pass the emissions test if you are still required to have one. i'd only recommend this on an emissions exempt car.
Exempt only means no test required. It does not mean that you can LEGALLY take it off.
Definately alot cheaper for those on a budget to remove it and fit a pipe in than to drop $100 plus on a high flow cat. Playing devils advocate though, getting caught without one could cost you heavily and make that money a high flow would have cost seem like chump change.
yeah thats my problem too. i dont have the money to go out and buy two free-flow cats. so i was thinking about a test pipe just to test it out and if for some reason i dont like it...i put the cats back in no problem
I had my cat off for about 4-5 years now along with the A.I.R system and when inspection time come i unbolt the test pipe and put it back on. pass and and it's off again.
and in all these years i never got a ticket, but you will get high of the unburnt gas and fumes lol
__________________ IF YOUR NOT LIVING ON THE EDGE YOUR JUST TAKING UP SPACE
Exempt only means no test required. It does not mean that you can LEGALLY take it off.
i never said i could legally take it off. i said that i wouldn't recommend it for a non-exempt car bc it prob wouldn't pass the sniffer test. i hollowed out mine not bc of the hp, i did it for the sound, and it sounds a LOT better than it did. and i had a Dynomax hi-flow cat. like i said, they can't give me a fine bc it LOOKS like i have a cat and they can only do an exterior visual inspection- they CAN'T take it off the car and check. and with my emissions exemption, there's no way anyone would know i have a hollow cat unless i told them.
LG4 305ci 4bbl motor, 2.5" Cherry Bomb Extreme muffler- side exit exhaust, Cragar 15x7 Black D Window wheels (4" backspacing), Cooper Cobra Radial GT tires (P235/60R15), 36mm hollow front sway bar with wonder bar, 24mm rear sway bar, Energy Suspension endlinks and Guldstrand bushings, Edelbrock Elite 4222 air cleaner with K&N filter, FF Dynamics 16" Cyclone electric fan, Flex-a-lite Variable Speed Fan Controller, custom fixed headlight conversion with 5000K HIDs and Silverstar Ultra H7 bulbs, Pilot PL-362W driving lights with Hella 100W H3 bulbs, Deka Intimidator 9A78DT AGM battery
LG4 305ci 4bbl motor, 2.5" Cherry Bomb Extreme muffler- side exit exhaust, Cragar 15x7 Black D Window wheels (4" backspacing), Cooper Cobra Radial GT tires (P235/60R15), 36mm hollow front sway bar with wonder bar, 24mm rear sway bar, Energy Suspension endlinks and Guldstrand bushings, Edelbrock Elite 4222 air cleaner with K&N filter, FF Dynamics 16" Cyclone electric fan, Flex-a-lite Variable Speed Fan Controller, custom fixed headlight conversion with 5000K HIDs and Silverstar Ultra H7 bulbs, Pilot PL-362W driving lights with Hella 100W H3 bulbs, Deka Intimidator 9A78DT AGM battery
That was exactally what I was planning on making....BACK ON THE FENCE!!! But I wouldn't destroy mine, I'd just keep it as a spare or back-up. I would get one the wreckers and hack that one up.
Last edited by y84pauloflondon; 10-06-2009 at 06:21 PM.
Nobody gets tickets or fines for not having a converter. Sure, they could, but it just doesnt happen in the real word. People trying to sell that angle are full of it.
Yeah, lets waste $100 bucks a pop on new cats that will probably last 2 years and do it all again then. Right. Great advice
Keep your original converter, get the test pipe, use both as needed.
Speaking of bad advice...If anyone has new cats and they last two years, it's not an issue with the cats.
Its going to be a tuning issue for sure.
So you, as long as you've been around this place, havent read about cats just falling apart? Specifically catco?
So no, its not "going to be a tuning issue for sure". There are plenty of cases of a substandard part, and honestly, from a pass the sniffer point of view, the originals are the best.
Last edited by arrowcamaro; 10-06-2009 at 08:57 PM.
So you, as long as you've been around this place, havent read about cats just falling apart? Specifically catco?
So no, its not "going to be a tuning issue for sure". There are plenty of cases of a substandard part, and honestly, from a pass the sniffer point of view, the originals are the best.
No I haven't. I had my Catco on much longer than two years. No to mention, if your strictly speaking about Catco, there are other brands out there. So no, there is no reason to say they're going to fail in 2 years if your just talking about one brand.
Last edited by IROCThe5.7L; 10-07-2009 at 01:00 AM.
No I haven't. I had my Catco on much longer than two years. No to mention, if your strictly speaking about Catco, there are other brands out there. So no, there is no reason to say they're going to fail in 2 years if your just talking about one brand.
Then I'd say you were lucky. There are many people that have had aftermarket converters physically fail. As in the stuffing comes apart and blows out the back side, jams up in the muffler, etc.
So like I said, it NOT going to be a tuning issue for sure as you stated. Many others have had them fail for other reasons too. Some in much less time then 2 years, and that includes other brands too.
Then I'd say you were lucky. There are many people that have had aftermarket converters physically fail. As in the stuffing comes apart and blows out the back side, jams up in the muffler, etc.
So like I said, it NOT going to be a tuning issue for sure as you stated. Many others have had them fail for other reasons too. Some in much less time then 2 years, and that includes other brands too.
In my opinion, the chances of a cat failing early because of a tuning issue such as running rich is much greater than it failing early just because it's defective.
Last edited by IROCThe5.7L; 10-08-2009 at 03:17 AM.
In my opinion, the chances of a cat failing early because of a tuning issue such as running rich is much greater than it failing early just because it's defective.
I think thats a much better assessment then what you originally stated.
LG4 305ci 4bbl motor, 2.5" Cherry Bomb Extreme muffler- side exit exhaust, Cragar 15x7 Black D Window wheels (4" backspacing), Cooper Cobra Radial GT tires (P235/60R15), 36mm hollow front sway bar with wonder bar, 24mm rear sway bar, Energy Suspension endlinks and Guldstrand bushings, Edelbrock Elite 4222 air cleaner with K&N filter, FF Dynamics 16" Cyclone electric fan, Flex-a-lite Variable Speed Fan Controller, custom fixed headlight conversion with 5000K HIDs and Silverstar Ultra H7 bulbs, Pilot PL-362W driving lights with Hella 100W H3 bulbs, Deka Intimidator 9A78DT AGM battery
before this gets locked......i think we got more important things to talk about than this **** about cats and emmissions. honestly people, don't give a flying **** about somebody a 1000 miles away from u.
thats what i did i took mine out cause i run cam 2 112 at the track so i took the cat out 
IF YOUR NOT LIVING ON THE EDGE YOUR JUST TAKING UP SPACE 
