Catalytic converter - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Troy 82 · 01-18-2003, 08:19 AM

I plan to replace my exhaust in a couple of weeks. The catalytic converter on there has an air tube but it's capped off. The truck didn't come with an air pump from the factory. So, the new converter I get doesn't need an air tube correct? Thanks!

Prerunner1982 · 01-18-2003, 09:37 AM

that should be correct. when i replaced the cat on my now non-existant exhaust it didnt have an a tube on it. but....now with no cats i dont have to worry about it..

and welcome to the board... pretty darn good guys....and gal(s) around here..with load of info to share...

**swervin ervin** · 01-18-2003, 01:53 PM

It sounds like someone has put another cat on. The stock cats didn't have the tube. All you need to get is a regular 3 way cat. I recommend a high flow model. Steer clear of the factory cats. They are expensive and don't flow very well. I would go with a 3" in/out cat for best performance.

And welcome.

Troy 82 · 01-18-2003, 09:38 PM

Thanks guys for the welcome. I'm familiar with alot of the names here, I used to post at CT once in awhile.

gchemist · 01-19-2003, 01:47 AM

Try a Catgo (?) from Summit Racing. I have one and it does fairly well. It was easy to blow out too.

Yes it was accident.

PHOENIX · 01-20-2003, 01:25 PM

Good question. I have been meaning to ask the same. I have the A.I.R. system on my truck and keeping it when I do my exhuast (not by choice, by law). So when I get a cat I need to get one without the little tube?

**swervin ervin** · 01-20-2003, 09:11 PM

Correctamundo Edrica.

LOHRTBT · 01-20-2003, 09:37 PM

Is it required in TX??

79BIG10 · 01-21-2003, 03:13 AM

I think 84 (83?) and older do not need cats. I didn't on mine.

PHOENIX · 01-21-2003, 12:44 PM

Heres another question. Should I have the cat welded in place?
Should I have the muffler welded in place?
If I didnt have you guys to ask Id weld the cat in place and bolt the muffler. Just case I need to change mufflers later for some reason. What do you guys think is the best?

**swervin ervin** · 01-21-2003, 01:12 PM

Eddie,

the easiest thing, and best way of doing it is what I'm going to do, as soon as I get my distributor back. I bought some Summit header collectors, 3" in my case. I have all my stuff welded to stop leaks. Well as you know, I can't remove anything without cutting if off. When I drop the y-pipe, it will only go as far as the crossmember. I going to have the collectors added in front of the cat so I can take it apart and remove the y-pipe. You could also add these to the muffler inlet just as easy. Clamping the tailpipe just don't cut it. It will still leak and you can't get it off very easy either.

bigd65 · 01-21-2003, 10:16 PM

i am wondering if the cat is what is what is wrong with my truck. i got under it the other day and hit the exhaust and i could hear the cat rattle. it aint but about 2-3 years old. i wonder if that is where all the problems are stemming from.

Troy 82 · 01-22-2003, 08:08 PM

I've looked at summitt site & the Catco converters. The three I came up with to get are CTO-6906, 8006, 9006. The first one is 14" long the other two are 16.5". The aftermarket cat I have on there now is 16.5" long. From what I read the difference in the 8006 & 9006 is one has an air tube. Summitt tech said CTO-6906. I called a couple muffler shops around here that carry Catco & the tell me CTO-9006. They said the 6906 is like a stock cat & the 9006 is High efficient. I'm leaning towards the 8006. What do you guys think?

bigd65 · 01-23-2003, 05:01 PM

welll i would get the HI-FLO cat

messed up c-10 · 01-23-2003, 05:34 PM

What about the Dynomax converters from Jegs? Are they any good?

messed up c-10 · 01-23-2003, 05:37 PM

Quote:

Originally posted by 79BIG10
I think 84 (83?) and older do not need cats. I didn't on mine.

Is that a state law? I thought that all trucks after 78 had to have cats. on them unless you live somewhere where there arnt emissons laws.

01-18-2003, 08:19 AM	#1
Troy 82 Registered User Join Date: Jan 2003 Location: Texas Posts: 75	Catalytic converter I plan to replace my exhaust in a couple of weeks. The catalytic converter on there has an air tube but it's capped off. The truck didn't come with an air pump from the factory. So, the new converter I get doesn't need an air tube correct? Thanks! __________________ Troy 1982 Silverado

01-18-2003, 09:37 AM	#2
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	that should be correct. when i replaced the cat on my now non-existant exhaust it didnt have an a tube on it. but....now with no cats i dont have to worry about it.. and welcome to the board... pretty darn good guys....and gal(s) around here..with load of info to share... __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

01-18-2003, 01:53 PM	#3
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	It sounds like someone has put another cat on. The stock cats didn't have the tube. All you need to get is a regular 3 way cat. I recommend a high flow model. Steer clear of the factory cats. They are expensive and don't flow very well. I would go with a 3" in/out cat for best performance. And welcome. __________________ Mike 1985 Chevy C-10

01-18-2003, 09:38 PM	#4
Troy 82 Registered User Join Date: Jan 2003 Location: Texas Posts: 75	Thanks guys for the welcome. I'm familiar with alot of the names here, I used to post at CT once in awhile. __________________ Troy 1982 Silverado

01-19-2003, 01:47 AM	#5
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Try a Catgo (?) from Summit Racing. I have one and it does fairly well. It was easy to blow out too. Yes it was accident. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

01-20-2003, 01:25 PM	#6
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Good question. I have been meaning to ask the same. I have the A.I.R. system on my truck and keeping it when I do my exhuast (not by choice, by law). So when I get a cat I need to get one without the little tube? __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

01-20-2003, 09:11 PM	#7
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Correctamundo Edrica. __________________ Mike 1985 Chevy C-10

01-20-2003, 09:37 PM	#8
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	Is it required in TX?? __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

01-21-2003, 03:13 AM	#9
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,775	I think 84 (83?) and older do not need cats. I didn't on mine. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

01-21-2003, 12:44 PM	#10
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Heres another question. Should I have the cat welded in place? Should I have the muffler welded in place? If I didnt have you guys to ask Id weld the cat in place and bolt the muffler. Just case I need to change mufflers later for some reason. What do you guys think is the best? __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

01-21-2003, 01:12 PM	#11
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Eddie, the easiest thing, and best way of doing it is what I'm going to do, as soon as I get my distributor back. I bought some Summit header collectors, 3" in my case. I have all my stuff welded to stop leaks. Well as you know, I can't remove anything without cutting if off. When I drop the y-pipe, it will only go as far as the crossmember. I going to have the collectors added in front of the cat so I can take it apart and remove the y-pipe. You could also add these to the muffler inlet just as easy. Clamping the tailpipe just don't cut it. It will still leak and you can't get it off very easy either. __________________ Mike 1985 Chevy C-10

01-21-2003, 10:16 PM	#12
bigd65 Registered User Join Date: Mar 2000 Location: Lake Jackson, TX. Posts: 1,930	i am wondering if the cat is what is what is wrong with my truck. i got under it the other day and hit the exhaust and i could hear the cat rattle. it aint but about 2-3 years old. i wonder if that is where all the problems are stemming from. __________________ 2004 Silverado Crewcab (Dark Spiral Gray)

01-22-2003, 08:08 PM	#13
Troy 82 Registered User Join Date: Jan 2003 Location: Texas Posts: 75	I've looked at summitt site & the Catco converters. The three I came up with to get are CTO-6906, 8006, 9006. The first one is 14" long the other two are 16.5". The aftermarket cat I have on there now is 16.5" long. From what I read the difference in the 8006 & 9006 is one has an air tube. Summitt tech said CTO-6906. I called a couple muffler shops around here that carry Catco & the tell me CTO-9006. They said the 6906 is like a stock cat & the 9006 is High efficient. I'm leaning towards the 8006. What do you guys think? __________________ Troy 1982 Silverado

01-23-2003, 05:01 PM	#14
bigd65 Registered User Join Date: Mar 2000 Location: Lake Jackson, TX. Posts: 1,930	welll i would get the HI-FLO cat __________________ 2004 Silverado Crewcab (Dark Spiral Gray)

01-23-2003, 05:34 PM	#15
messed up c-10 RHCP afficianado Join Date: Oct 2002 Location: McLoud, OK Posts: 789	What about the Dynomax converters from Jegs? Are they any good? __________________ ~Ryan~ 89 S-10 Blazer with a 4.3L 96 Ford Crown Vic P71 4.6L V8. This car rocks. Here are some links to some good music. Jack Johnson Donavon Frankenreiter



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