Catalytic Converter

samuelcosmo76 · 02-08-2010, 07:27 PM

I heard its a good idea to cut out the catalytic converter for better mileage. New York doesn't make my car pass emissions, so i don't think it would be a problem. Is this something that's worth doing?

thanks!

volaredon · 02-08-2010, 08:02 PM

depends on how the car runs with it. Technically it's still illegal to take one off w/o replacing it if your came with it.

John Van · 02-08-2010, 08:27 PM

Sam , in NY if your car is more than 25 years old,no emissions,no equipment check, so get rid of the cat.

64polara · 02-09-2010, 04:52 AM

Quote:

Originally Posted by volaredon

depends on how the car runs with it. Technically it's still illegal to take one off w/o replacing it if your came with it.

i hate that law. after 25 (maybe a little differant in other places) years, they say "oh, no more emissions tests." but then they say it is illegal to tamper with anything emissions.

i say go for it.

samuelcosmo76 · 02-09-2010, 07:15 AM

Heh...I know I don't have to pass emmissions in NY, but even if I did, i have a guy what will pass anyone no matter what haha.

So I guess I'll give it a shot. Can i just gut the thing and put it back, or should I put a piece of straight pipe?

Tehone · 02-09-2010, 07:17 AM

I would just get some type of straight pipe made and installed. If you ever feel the need to change it back, you still have the cat!

Crazy4Carz.Com · 02-09-2010, 12:59 PM

BULL CRAP!!!! High flow cats flow better, cost little and keep you legal. You have done other performance mods right? so it really isn't mileage you are looking for, it is performance right? Forget it. There are street legal cars running single digits with cats. Leave it alone.

samuelcosmo76 · 02-09-2010, 02:19 PM

nope....no performance mods on my slant 6. just looking for a little better mileage! If anything, it can't HURT to get rid of it.....?

MrOldart2U · 02-09-2010, 03:36 PM

Quote:

Originally Posted by samuelcosmo76

nope....no performance mods on my slant 6. just looking for a little better mileage! If anything, it can't HURT to get rid of it.....?

Well I wont hurt but it probably wont help gain MPG, unless its on verge of stopping up...JMO

Crazy4Carz.Com · 02-09-2010, 05:54 PM

Quote:

Originally Posted by MrOldart2U

Well I wont hurt but it probably wont help gain MPG, unless its on verge of stopping up...JMO

X2

Nothing to be gained. You can just kill resale value, and make it illegal. will you get caught? maybe not but why go there.

67 GTX · 02-09-2010, 06:38 PM

Quote:

Originally Posted by Crazy4Carz.Com

and make it illegal. will you get caught? maybe not but why go there.

its legal here though

samuelcosmo76 · 02-09-2010, 06:50 PM

Exactly. So i feel like i should at least TRY it haha

Crazy4Carz.Com · 02-10-2010, 03:32 AM

Quote:

Originally Posted by 67 GTX

its legal here though

Nope. The federal gvt says you cannot modify emissions systems. regardless of your local enforcement, you cannot remove a cat.

old tired rebel · 02-10-2010, 05:46 AM

Just remember don't tell.

Frank the Tank · 02-10-2010, 06:51 AM

Look into a cheap aftermarket replacement by Dynomax or Summit to help with performance/gas mileage if you are concerned with the law. I would cut it off and leave an open pipe, but here in NC emisions laws are never enforced

64polara · 02-10-2010, 09:35 AM

Quote:

Originally Posted by Crazy4Carz.Com

Nope. The federal gvt says you cannot modify emissions systems. regardless of your local enforcement, you cannot remove a cat.

thats the law i hate. they say oh ya you dont even have to have one anymore were not going to check! but if you change anything your still in trouble.

mopardrt · 02-10-2010, 01:32 PM

TAKE UM OFF! I mean a little slant six is going to really have to work hard to push a four door dart so i mean theres not much your going to be able to do for increase MPG

67gtxclone · 02-10-2010, 06:47 PM

I agree with Crazy. I would leave it alone. If you are set on doing it, then cut it out, put a straight pipe in and save the original so you can put it back if you need/want to.

theomahamoparguy · 02-10-2010, 11:28 PM

cats from the 70's/early eighties were not known for their high flow rates.
I would remove the cat temporarily and replace it with the pipe. However, dont drive into any other states that look at this kind of stuff. It's true NY wont mess with ya but Mass. might. Replace the cat with a high flow unit at some time. The feds dont drive around looking at cars from the 70's to see if they have a cat or not but some states do. I dont worry about such things out here in the midwest but.

old tired rebel · 02-11-2010, 07:46 AM

Quote:

Originally Posted by Frank the Tank

Look into a cheap aftermarket replacement by Dynomax or Summit to help with performance/gas mileage if you are concerned with the law. I would cut it off and leave an open pipe, but here in NC emisions laws are never enforced

Not any more they are checking to see if the cats are there or not. The emission testing is on OBDII but the older cars and trucks all their emission equipment has to be on the vehicle.Doesn't matter if it works or not.

Frank the Tank · 02-11-2010, 10:44 AM

A trick that we do is cut and peel the shell of the cat and wrap it back over a straight pipe. When you face the welds to the floor of the car, knowone will ever know. This can only be done with certian cats though due to the various shapes and materials, and internals. My friends and I have done this with cats and mufflers

birds · 02-11-2010, 11:43 AM

It's illegal to take off.
That law is rarely enforced.
It won't make your performance/mileage any worse.
It might make the car harder to sell.

That's really all you need to know. The decision is yours, taking all that into account. I know what I would do but that's me.

samuelcosmo76 · 02-11-2010, 12:18 PM

Quote:

Originally Posted by Frank the Tank

A trick that we do is cut and peel the shell of the cat and wrap it back over a straight pipe. When you face the welds to the floor of the car, knowone will ever know. This can only be done with certian cats though due to the various shapes and materials, and internals. My friends and I have done this with cats and mufflers

isn't that the same as just knocking the guts out of it and putting it back?

old tired rebel · 02-11-2010, 12:34 PM

Quote:

Originally Posted by samuelcosmo76

isn't that the same as just knocking the guts out of it and putting it back?

Yes or driving a straight pipe through with enough on the ends to cut off to weld it back on with.

mopardrt · 02-11-2010, 12:39 PM

Its not going to affect the resale of the car. Save the caty and if u dont like the results then put it back on. I dont understand why people are ranting and raving about legality issus, it may be ilegal in certain places but so is reving your motor to loud and spinning your back tires but im sure evreyone here has done that.

samuelcosmo76 · 03-06-2010, 12:38 PM

Knocked the guts out of the cat this morning. It sounds a little different, not sure about anything else yet.

mopardrt · 03-06-2010, 01:47 PM

as long as your happy thats what its about Im kinda mad we cut and scraped evreything out of my 75 4 door dart I would have had a ton of parts for you.... that car was in great condition

D Dodge · 03-07-2010, 01:02 PM

That's not nice!

samuelcosmo76 · 03-07-2010, 03:31 PM

yo. i need this.

http://www.youtube.com/watch?v=B9ufhkmagJ4

D Dodge · 03-08-2010, 07:47 AM

Quote:

Originally Posted by samuelcosmo76

yo. i need this.

http://www.youtube.com/watch?v=B9ufhkmagJ4

Those flamethrowers ignite the unburned exhaust gas, so you would have to get rid of your catalytic converter for those to work.

02-08-2010, 07:27 PM	#1 (permalink)
samuelcosmo76 Mopar Fanatic Join Date: Aug 2009 Location: NYC Posts: 212	Catalytic Converter I heard its a good idea to cut out the catalytic converter for better mileage. New York doesn't make my car pass emissions, so i don't think it would be a problem. Is this something that's worth doing? thanks!

02-08-2010, 08:27 PM	#3 (permalink)
John Van 440 lover Join Date: Jun 2009 Location: Rensselaer,New York Posts: 125	Sam , in NY if your car is more than 25 years old,no emissions,no equipment check, so get rid of the cat. __________________ Beer is proof that god loves us and wants us to be happy- Ben Franklin

02-09-2010, 12:59 PM	#7 (permalink)
Crazy4Carz.Com Mopar Lover Join Date: Apr 2008 Posts: 872	BULL CRAP!!!! High flow cats flow better, cost little and keep you legal. You have done other performance mods right? so it really isn't mileage you are looking for, it is performance right? Forget it. There are street legal cars running single digits with cats. Leave it alone. __________________

02-10-2010, 05:46 AM	#14 (permalink)
old tired rebel Mopar Fanatic Join Date: Sep 2009 Location: Winston Salem NC Posts: 388	Just remember don't tell. __________________ Click my sig to see my garage!

02-10-2010, 01:32 PM	#17 (permalink)
mopardrt Mopar Lover Join Date: Feb 2010 Location: Detroit Michigan Posts: 651	TAKE UM OFF! I mean a little slant six is going to really have to work hard to push a four door dart so i mean theres not much your going to be able to do for increase MPG __________________ MY RIDE? 1974 dodge dart swinger 318

02-08-2010, 08:02 PM	#2 (permalink)
volaredon Member Join Date: Feb 2010 Posts: 89	depends on how the car runs with it. Technically it's still illegal to take one off w/o replacing it if your came with it.

02-09-2010, 07:15 AM	#5 (permalink)
samuelcosmo76 Mopar Fanatic Join Date: Aug 2009 Location: NYC Posts: 212	Heh...I know I don't have to pass emmissions in NY, but even if I did, i have a guy what will pass anyone no matter what haha. So I guess I'll give it a shot. Can i just gut the thing and put it back, or should I put a piece of straight pipe?

02-09-2010, 07:17 AM	#6 (permalink)
Tehone Junior Member Join Date: Dec 2009 Posts: 3	I would just get some type of straight pipe made and installed. If you ever feel the need to change it back, you still have the cat!

02-09-2010, 02:19 PM	#8 (permalink)
samuelcosmo76 Mopar Fanatic Join Date: Aug 2009 Location: NYC Posts: 212	nope....no performance mods on my slant 6. just looking for a little better mileage! If anything, it can't HURT to get rid of it.....?

02-09-2010, 06:50 PM	#12 (permalink)
samuelcosmo76 Mopar Fanatic Join Date: Aug 2009 Location: NYC Posts: 212	Exactly. So i feel like i should at least TRY it haha

02-10-2010, 06:51 AM	#15 (permalink)
Frank the Tank Member Join Date: Dec 2009 Location: Wilmington NC Posts: 43	Look into a cheap aftermarket replacement by Dynomax or Summit to help with performance/gas mileage if you are concerned with the law. I would cut it off and leave an open pipe, but here in NC emisions laws are never enforced

02-10-2010, 06:47 PM	#18 (permalink)
67gtxclone Senior Member Join Date: Aug 2009 Location: Jefferson, OR Posts: 582	I agree with Crazy. I would leave it alone. If you are set on doing it, then cut it out, put a straight pipe in and save the original so you can put it back if you need/want to. __________________ 1967 GTX clone with 440, 4 speed, and 3:55 suregrip.

02-10-2010, 11:28 PM	#19 (permalink)
theomahamoparguy Senior Member Join Date: Mar 2009 Location: Springfield NE Posts: 763	cats from the 70's/early eighties were not known for their high flow rates. I would remove the cat temporarily and replace it with the pipe. However, dont drive into any other states that look at this kind of stuff. It's true NY wont mess with ya but Mass. might. Replace the cat with a high flow unit at some time. The feds dont drive around looking at cars from the 70's to see if they have a cat or not but some states do. I dont worry about such things out here in the midwest but.

02-11-2010, 10:44 AM	#21 (permalink)
Frank the Tank Member Join Date: Dec 2009 Location: Wilmington NC Posts: 43	A trick that we do is cut and peel the shell of the cat and wrap it back over a straight pipe. When you face the welds to the floor of the car, knowone will ever know. This can only be done with certian cats though due to the various shapes and materials, and internals. My friends and I have done this with cats and mufflers

02-11-2010, 11:43 AM	#22 (permalink)
birds Member Join Date: Nov 2009 Posts: 36	It's illegal to take off. That law is rarely enforced. It won't make your performance/mileage any worse. It might make the car harder to sell. That's really all you need to know. The decision is yours, taking all that into account. I know what I would do but that's me.

02-11-2010, 12:39 PM	#25 (permalink)
mopardrt Mopar Lover Join Date: Feb 2010 Location: Detroit Michigan Posts: 651	Its not going to affect the resale of the car. Save the caty and if u dont like the results then put it back on. I dont understand why people are ranting and raving about legality issus, it may be ilegal in certain places but so is reving your motor to loud and spinning your back tires but im sure evreyone here has done that. __________________ MY RIDE? 1974 dodge dart swinger 318

03-06-2010, 12:38 PM	#26 (permalink)
samuelcosmo76 Mopar Fanatic Join Date: Aug 2009 Location: NYC Posts: 212	Knocked the guts out of the cat this morning. It sounds a little different, not sure about anything else yet.

03-06-2010, 01:47 PM	#27 (permalink)
mopardrt Mopar Lover Join Date: Feb 2010 Location: Detroit Michigan Posts: 651	as long as your happy thats what its about Im kinda mad we cut and scraped evreything out of my 75 4 door dart I would have had a ton of parts for you.... that car was in great condition __________________ MY RIDE? 1974 dodge dart swinger 318

03-07-2010, 03:31 PM	#29 (permalink)
samuelcosmo76 Mopar Fanatic Join Date: Aug 2009 Location: NYC Posts: 212	yo. i need this. http://www.youtube.com/watch?v=B9ufhkmagJ4

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