Go Back   DodgeForum.com > Dodge SUVs > Dodge Durango > 1st Gen Durango
Sign in using an external account
Register Forgot Password?


1st Gen Durango 1998 - 2003 Durango's

Catalytic Converter Replacement

Reply
 
 
 
 
Thread Tools Search this Thread
  #1  
Old 09-07-2007, 01:53 PM
durango037 durango037 is offline
 
Join Date: Feb 2007
Location:
Posts: 11
Default Catalytic Converter Replacement

Hello all!!! Looking for some information on replacing a catalytic converter. I bought a Magnaflow 94000 series Hi Flow Cat and Magnaflow exhaust system and would like to install them myself if possible. I have searched for threads on how to replace the cat, since thats probably the hardest part, but I don't see many installation instructions. Does the cat have to be cut off and then the new one welded on? I am pretty sure the exhaust system is bolt on after the cat, so that shouldn't be much of a problem. I think installing the new cat is going to be the hardest. Anyone have any suggestions, can I cut the cat off and clamp it until it can be welded or is taking it to a muffler shop the easiest way.

Thanks for the help!!!!
This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!
__________________
03' Durango, Black, 4.7L, 3.55 gears, 5-Speed Auto, Leather,
Reply With Quote
  #2  
Old 09-07-2007, 02:23 PM
Mean Green's Avatar
Mean Green Mean Green is offline
Champion
 
Join Date: Jun 2006
Vehicle: 00' Dodge Durango
Location: Reno, NV
Posts: 4,175
Default RE: Catalytic Converter Replacement

I'd just take it to a muffler shop if you don't have a way to weld it/you can't weld. It shouldn't cost much at all just call around and find the best deal in your area.
__________________

HD Diesel Mechanic
00 Durango 5.9L SLT
I've got a few things done
Reply With Quote
  #3  
Old 09-07-2007, 08:37 PM
n8ech n8ech is offline
Record Breaker
 
Join Date: Nov 2006
Vehicle: 04 Durango Hemi SLT
Location: Ohio
Posts: 1,195
Default RE: Catalytic Converter Replacement

D037:

What is the reason for replacing the cat?? If it is not bad, why spend the bucks? FYI, the OEM cats on the 00 and newer Durangos flow pretty good as is. Unless you are going to spend alot of time in the 4-5k rpm range I don't see a benefit to the switch.

Don
__________________
2004 Durango SLT AWD 5.7 Hemi Flame Red with 3.55's
2004 Ford Crown Victoria Sport 4.6L Midnite Gray with 3L27's
2011 Hyundai Santa Fe GLS AWD V6 Mineral Gray (Hers)
Reply With Quote
  #4  
Old 09-09-2007, 12:40 AM
Crazy4x4RT's Avatar
Crazy4x4RT Crazy4x4RT is offline
Offroad Dakota Moderator
Dodge Forum Moderator
 
Join Date: Aug 2007
Vehicle: 93 Dakota
Location: NM
Posts: 10,828
Default RE: Catalytic Converter Replacement

If the cat you bought is a direct fit then you will need to take off the old one. It may be hard to take off. After time and all the heat it kinda welds it together. I used a comealong on both ends to pull it off. I broke one. So I used my friends truck to pull it off of the other pipe. maybe you will be lucky. If it is not a direct fit it will need to be welded. or take apart your old one and gut it out. best flow you can get. the way I did it was take a long skiny pipe and hit it in with a slug hammer. It will all brake up over time. Where I live there is emisssion laws. but they visually see its there (they dont know its empty) and my truck passes with it like that no problems.
__________________
My Youtube Videos! ----My Photo Albums---Solid Axle Swap ----- Leaf Spring Swap/flip ----2wd-4wd swap

"No truck should ever be lowerd! NEVER" Buy a car if you want it low!
Reply With Quote
  #5  
Old 09-09-2007, 08:05 PM
Mean Green's Avatar
Mean Green Mean Green is offline
Champion
 
Join Date: Jun 2006
Vehicle: 00' Dodge Durango
Location: Reno, NV
Posts: 4,175
Default RE: Catalytic Converter Replacement

Not a good idea to gut the cat unless you buy an O2 sim, Our D's will give you a CEL and lean out otherwise. That and emissions testing will get you.
__________________

HD Diesel Mechanic
00 Durango 5.9L SLT
I've got a few things done
Reply With Quote
  #6  
Old 09-10-2007, 12:28 AM
durangeddurango durangeddurango is offline
Professional
 
Join Date: Sep 2007
Location:
Posts: 180
Default RE: Catalytic Converter Replacement

if you purchased a 94007 only minor welding will be required to complete install
Reply With Quote
  #7  
Old 12-06-2007, 11:29 AM
dmh80 dmh80 is offline
 
Join Date: Dec 2007
Posts: 2
Default RE: Catalytic Converter Replacement

I just bought a Durango 2 months ago and I'm looking to either gut or replace the cat with a straight pipe. What would be best and what's the best way of doing it.
Reply With Quote
  #8  
Old 12-06-2007, 11:12 PM
hydrashocker's Avatar
hydrashocker hydrashocker is offline
Hall Of Fame
 
Join Date: Jun 2005
Vehicle: 99' Ram 2500 V-10 Sport QC 4X4
Location: GJ, Colorado
Posts: 14,213
Default RE: Catalytic Converter Replacement

Just replace the cat. Then go from there.

Come on guys why just gut it. Your rigs will run so much better if you just replace it with a hi flow 3 inch replacement then go 3" back exhaust.
__________________

Moto: I don't take sides --- #1 - V10 Club - Club Member

AKA....The Durango Section Godfather
Reply With Quote
  #9  
Old 12-10-2007, 11:23 AM
dmh80 dmh80 is offline
 
Join Date: Dec 2007
Posts: 2
Default RE: Catalytic Converter Replacement

what's the benefit with replacing it with a new one than straight piping it, other that spending $.
Reply With Quote
  #10  
Old 12-10-2007, 01:12 PM
Kensai's Avatar
Kensai Kensai is offline
Champion
 
Join Date: Dec 2003
Vehicle: 2000 Black Durango R/T
Location: Dallas, Tx
Posts: 2,571
tommy chau tommychau00
Default RE: Catalytic Converter Replacement

Quote:
ORIGINAL: dmh80

what's the benefit with replacing it with a new one than straight piping it, other that spending $.
Simple answer:

Emissions

More and more places that normally do not have annual emissions testing are now requiring this test. So going straight pipe, you may not pass inspection and will have to install one back on later. I would do as Hydra suggested, Get a high flow cat.

It's good to be a contributor to a greener environment! Our D's pollute enough as it is.
__________________
Black 2000 Durango 5.9 R/T, Infinity Reference 6012i, Clear Headlight lens,
Fastman 52mm ThrottleBody,Fastman custom built Tranny,Castrol Full Syntec,
OEM K&N Air filter,Monroe Reflexes,BFG LongTrail Touring T/A's,180 Stat,
F1 Airgap Intake,Champion IR Truck Plugs,Custom Made Ram Air Intake, Hughes SCT Tuner
Reply With Quote
  #11  
Old 12-10-2007, 10:38 PM
durangeddurango durangeddurango is offline
Professional
 
Join Date: Sep 2007
Location:
Posts: 180
Default RE: Catalytic Converter Replacement

I have a valid question if any body in the forum can prove this.
what is a high flow cat? what are you cfm ratings? all replacement convertors say high flow. what are the flow ratings vs stock convertors?

and as it goes for gutting the cat you will get a cel however there is a way around a 420 code use spark plug antifoulers.remove the rear o2 install antifoulers (some cars require 2-4) reinstall o2 inside the antifouler. what you are doing is lifting the o2 from the exhaust stream does not effect drivabilty and allows for a race use only cat or no cat at all.
Reply With Quote
  #12  
Old 12-15-2007, 09:04 PM
hydrashocker's Avatar
hydrashocker hydrashocker is offline
Hall Of Fame
 
Join Date: Jun 2005
Vehicle: 99' Ram 2500 V-10 Sport QC 4X4
Location: GJ, Colorado
Posts: 14,213
Default RE: Catalytic Converter Replacement

I'll try to answer your question.

OEM cat from what I read up on flows approx. 250 CFM. Magnaflow is approx 325 CFM. But the thing is that not only are you replacing with hi flow development, the better thing is to replace with a larger flowing capacity. OEM is 2.5 inch from the manifolds down. The thing is it Y's together and then into the cat at 2.5 and choke the exhaust. The proper way to deal with this issue is to cut the Y off and have the 2.5 inch from eachsides of the motor meet in a replaced Y that converts to 3 inch.

Then installing a 3 inch converter as well as a 3 inch cat back system flows free unlike stock. AnOEM flow thru exhaust system flows about 250 max.This is because they are notset up to flow but rather, get the job done.When installing a true Cat and back system with Y conversion you can get about anaprox. of about 35 HP plus performance and fuel MPG's. Now I have seen claims of up to 480 CFM on the 5.9L although these are from very good sorses but no dynometer charts that I have seen.

Now I can vow to the claims. My truck woke up. But everyone is intitled to the own opinion.
__________________

Moto: I don't take sides --- #1 - V10 Club - Club Member

AKA....The Durango Section Godfather
Reply With Quote
  #13  
Old 12-16-2007, 04:29 PM
durangeddurango durangeddurango is offline
Professional
 
Join Date: Sep 2007
Location:
Posts: 180
Default RE: Catalytic Converter Replacement

Quote:
ORIGINAL: hydrashocker

I'll try to answer your question.

OEM cat from what I read up on flows approx. 250 CFM. Magnaflow is approx 325 CFM. But the thing is that not only are you replacing with hi flow development, the better thing is to replace with a larger flowing capacity. OEM is 2.5 inch from the manifolds down. The thing is it Y's together and then into the cat at 2.5 and choke the exhaust. The proper way to deal with this issue is to cut the Y off and have the 2.5 inch from eachsides of the motor meet in a replaced Y that converts to 3 inch.

Then installing a 3 inch converter as well as a 3 inch cat back system flows free unlike stock. AnOEM flow thru exhaust system flows about 250 max.This is because they are notset up to flow but rather, get the job done.When installing a true Cat and back system with Y conversion you can get about anaprox. of about 35 HP plus performance and fuel MPG's. Now I have seen claims of up to 480 CFM on the 5.9L although these are from very good sorses but no dynometer charts that I have seen.

Now I can vow to the claims. My truck woke up. But everyone is intitled to the own opinion.
well hydra I have to give this to you you are the first person to attempt to answer this question as I have asked this many times to the manufactures I distribute to and for. bigger is not always better when it comes to pipe. larger diameter pipe can have negative consequences. lower torque worse fuel economy. but you could achieve high end horsepower at higher rpm range usually at 3000 rpm and up. in all honesty for the stock d owner it will actually compromise performance gains using a 2.5 head pipe into a single 3. with 2.5 the surface area with 2 pipes would be 5 inch.with that surface area you would need amotor building over 450 hpfor that exhaust to be tuned properly.
I have been to many exhaust confrences, with magnaflow,flowmaster,xlerator,borla,red deer,goerlich,walker,dynomax,catco,jones,flo-pro, and aero turbine. and the question that i ask seem to turn the reps in a stir for explanations. I have a confrence coming up in febuary in which all the above mentioned will be there.and can't wait till i drop a bomb at flowmaster in which they don't reccomend x-pipes for use with thier mufflers rather they and i quote " usea h-pipeor ourd-port pipe with our mufflers" and they wouldn't explain why.but that isfordiscussion in adifferent thread. I design and manufacture custom pipes for a range of applications, and different manufactures for aftermarket performance companies. I wouldn't be surprised if a few forum memebers hereare running my design and manufactured pipe sold under a different name.
Reply With Quote
  #14  
Old 12-17-2007, 11:05 AM
hydrashocker's Avatar
hydrashocker hydrashocker is offline
Hall Of Fame
 
Join Date: Jun 2005
Vehicle: 99' Ram 2500 V-10 Sport QC 4X4
Location: GJ, Colorado
Posts: 14,213
Default RE: Catalytic Converter Replacement

Nice to hear that someone knows this stuff. I'm vague, but tried.

Sounds like you are one that can answer your own question. I poured over hours of documents on this stuff just to try to answer this one. You are right about potential damage from little or no back pressure. This can lead to warping heads, burnt valves, and torque loss. Sure plain old horse power increase, with the following if your motor isn't built right to handle the exhaust.

I feel that a back pressure of 1 to 2 lbs. back pressure is good.

3 lbs. is getting too much in my opinion.

Just like headers. Well that is for another thread.
__________________

Moto: I don't take sides --- #1 - V10 Club - Club Member

AKA....The Durango Section Godfather
Reply With Quote
  #15  
Old 09-06-2008, 06:30 PM
spyder98 spyder98 is offline
Registered User
 
Join Date: Sep 2008
Location: ANAHEIM
Posts: 25
Default

Hey guys I have question if i replace the cat with this one will it still pass smog here in California? i got the 420 code thats the reason im replacing it

http://www.partsamerica.com/ProductD...pe=145&PTSet=A
Reply With Quote
  #16  
Old 09-07-2008, 08:32 PM
MEINEKEMAN1's Avatar
MEINEKEMAN1 MEINEKEMAN1 is offline
Captain
 
Join Date: May 2008
Location: PA
Posts: 521
Default

Quote:
Originally Posted by durangeddurango View Post
well hydra I have to give this to you you are the first person to attempt to answer this question as I have asked this many times to the manufactures I distribute to and for. b***er is not always better when it comes to pipe. larger diameter pipe can have negative consequences. lower torque worse fuel economy. but you could achieve high end horsepower at higher rpm range usually at 3000 rpm and up. in all honesty for the stock d owner it will actually compromise performance gains using a 2.5 head pipe into a single 3. with 2.5 the surface area with 2 pipes would be 5 inch.with that surface area you would need amotor building over 450 hpfor that exhaust to be tuned properly.
I have been to many exhaust confrences, with magnaflow,flowmaster,xlerator,borla,red deer,goerlich,walker,dynomax,catco,jones,flo-pro, and aero turbine. and the question that i ask seem to turn the reps in a stir for explanations. I have a confrence coming up in febuary in which all the above mentioned will be there.and can't wait till i drop a bomb at flowmaster in which they don't reccomend x-pipes for use with thier mufflers rather they and i quote " usea h-pipeor ourd-port pipe with our mufflers" and they wouldn't explain why.but that isfordiscussion in adifferent thread. I design and manufacture custom pipes for a range of applications, and different manufactures for aftermarket performance companies. I wouldn't be surprised if a few forum memebers hereare running my design and manufactured pipe sold under a different name.

BUMP THIS!!

LMAO,I have posted in 2 other threads concerning the same thing but figured I would opt out of a 3rd.Good to see another guy in the field with "HANDS ON" experience posting up.
__________________
1999 RAM 1500 QC,4X4 5.9L
5 INCH SKYJACKER LIFT KIT
35' MICKEY THOMPSON BAJA CLAWS ON DICK CEPEK RIMS
Reply With Quote
  #17  
Old 09-14-2008, 03:53 PM
spyder98 spyder98 is offline
Registered User
 
Join Date: Sep 2008
Location: ANAHEIM
Posts: 25
Default

okay guys i changed the LDP and that made no difference. I went ahead and replaced the catalytic converter. The D still Stall alot. Seems to be backfiring and the D has no power at all. I will be replacing the PCM see if that the problem
Reply With Quote
  #18  
Old 09-23-2008, 10:54 AM
spyder98 spyder98 is offline
Registered User
 
Join Date: Sep 2008
Location: ANAHEIM
Posts: 25
Default

Well a little update on this found out my Cat went out with in a couple days of installing it. The muffler shop said the D: is running to rich. this is the reason I had lost all power on my. its been a couple of days and my D: hasnt stalled so im happy about that
Reply With Quote
Old 09-23-2008, 10:54 AM
 
 
 
Reply




Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join DodgeForum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -4. The time now is 05:17 PM.

Internet Brands, Inc.


Contact Details & Emails