Go Back   DodgeForum.com > Dodge Trucks > Dodge Dakota > 2nd Gen Dakota
Sign in using an external account
Register Forgot Password?


2nd Gen Dakota 1997 - 2004 Dakota's

Flex Pipe Question

Reply
 
 
 
 
Thread Tools Search this Thread
  #1  
Old 07-09-2013, 09:46 PM
RollerRed RollerRed is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 98 Dakota
Location: Milton, Wa
Posts: 395
Default Flex Pipe Question

So now that my starter is fixed and everything seems to be running smoothly I am going to get rid of my rattling cat. Question is I don't want a cat anymore and was wondering if anyone knows anything about Flex pipes?
http://www.autozone.com/autozone/acc...ier=255970_0_0_

This is what I am thinking in place of the cat. It is stainless and straight through...which should be great for when I slap my new muffler on for sound.
Any thoughts on this?
This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!
Reply With Quote
  #2  
Old 07-09-2013, 10:58 PM
kingr00's Avatar
kingr00 kingr00 is offline
Amateur
 
Join Date: Jun 2013
Posts: 30
Default

Will taking out the cat have any affect on the O2 sensors?
Reply With Quote
  #3  
Old 07-09-2013, 11:00 PM
moe7404 moe7404 is offline
Record Breaker
 
Join Date: Jul 2007
Location:
Posts: 2,037
Default

in the OLD days we would take the cat out. then use a heavy metal rod and punch the guts out of it. then put it back in. and it looks like it is fine.. BUT it might have a rattle of funny sound. that was a long time ago. i would not use flex tubing for exhaust. good luck.
__________________
moe
Reply With Quote
  #4  
Old 07-09-2013, 11:35 PM
Brian in Tucson's Avatar
Brian in Tucson Brian in Tucson is offline
Captain
 
Join Date: Mar 2013
Vehicle: 96 DAKOTA
Location: In a hole
Posts: 692
Default

Quote:
Originally Posted by RollerRed View Post
So now that my starter is fixed and everything seems to be running smoothly I am going to get rid of my rattling cat. Question is I don't want a cat anymore and was wondering if anyone knows anything about Flex pipes?
http://www.autozone.com/autozone/acc...ier=255970_0_0_

This is what I am thinking in place of the cat. It is stainless and straight through...which should be great for when I slap my new muffler on for sound.
Any thoughts on this?
Yeah, but not in polite company. Don't you have smog testing in Pierce County? Ya think you'll pass without a cat?
Reply With Quote
  #5  
Old 07-09-2013, 11:36 PM
RollerRed RollerRed is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 98 Dakota
Location: Milton, Wa
Posts: 395
Default

I've read a lot of people do exhaust work and just tie the 2nd O2 up onto the frame and never get any CEL's because of it. I will be leaving both of them right where they are, Just going to cut right at both ends of the Cat.
A lot of cars that I have worked on have flex pipes just like the one I'm interested in to cut back on exhaust rattle. I am really feeling this for simplicity sake...

Also where I live there is no testing, so I am golden!
Reply With Quote
  #6  
Old 07-10-2013, 01:08 PM
hanleysh hanleysh is offline
Professional
 
Join Date: Jan 2010
Vehicle: 03 Dakota Quad Cab 5.9L
Location: Port Royal PA
Posts: 236
Default

You can put a non-fowler on the o2 sensor and it wont throw a code(just moves the sensor out of the pipe so it reads a lower temp) but flex pipe is a bad idea. Not sure where youre located but in PA its only legal on a diesel.
Reply With Quote
  #7  
Old 07-10-2013, 03:20 PM
RollerRed RollerRed is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 98 Dakota
Location: Milton, Wa
Posts: 395
Default

Well its either a flex pipe or just a straight pipe where the cat used to be...
Why is everyone so against the flex pipe though? Straight pipe is similar to a flex pipe, plus for people that have hollowed out their cats you would have noticed a difference in performance and noise I am sure?
Now I'm not looking for a real performance boost, just ease of instalation and to keep cost down. $25-$30 for me to install a flex pipe vs $150 to have someone weld up a new cat...Doesn't that seem intelligent for those that don't need to do emissions?
Reply With Quote
  #8  
Old 07-10-2013, 05:50 PM
LAKOTA169's Avatar
LAKOTA169 LAKOTA169 is offline
All Star
 
Join Date: Sep 2005
Vehicle: 2005 Magnum R/T, 2000 Dakota R/T, 1937 Plymouth Business Coupe
Posts: 929
Default

Back in the '70's, I had a custom van that I put side exhaust on. To connect the headers to the side pipes, they used flex pipe. It burned through within 6 months. I replaced the flex with solid pipe and didn't have any more problems. It might be cheaper at first, but then add in the expense to redo it again in a few months.
__________________
Caution: Detroit may be hazardous to your health.

Law Enforcement: Sworn to protect your butt, not kiss it.
Reply With Quote
  #9  
Old 07-10-2013, 06:34 PM
dodgeramguy85's Avatar
dodgeramguy85 dodgeramguy85 is offline
Grand Champion
 
Join Date: Mar 2008
Vehicle: 02 Ram 2500 cummins
Location: Houtzdale,PA
Posts: 5,418
Michael Kokoskie
Default

Its cheaper to get a piece of straight pipe... Use that and be done with it.
__________________
Reply With Quote
  #10  
Old 07-10-2013, 07:32 PM
RollerRed RollerRed is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 98 Dakota
Location: Milton, Wa
Posts: 395
Default

Fine Fine. Straight pipe it is! Just thought I would be different...
So just to clarify you have to pull the rear O2 and put a cap on it when you zip it to the frame? You cant leave it it attached when you cut the cat?

Also on a side note...bad a** van! Wish I had one like that!
Reply With Quote
  #11  
Old 07-10-2013, 09:00 PM
dodgeramguy85's Avatar
dodgeramguy85 dodgeramguy85 is offline
Grand Champion
 
Join Date: Mar 2008
Vehicle: 02 Ram 2500 cummins
Location: Houtzdale,PA
Posts: 5,418
Michael Kokoskie
Default

You could just punch the cat out too
Reply With Quote
  #12  
Old 07-10-2013, 09:07 PM
Tom A's Avatar
Tom A Tom A is offline
Section Moderator
Dodge Forum Moderator
 
Join Date: May 2012
Vehicle: 1997 Dakota Sport 4x4
Location: Concord, CA
Posts: 1,474
Default

Quote:
Originally Posted by dodgeramguy85 View Post
You could just punch the cat out too
I'd hang on to the cat in case it ever needs to be reinstalled for any reason. If you hollow it out, it obviously can't be returned to stock.
__________________
http://i286.photobucket.com/albums/ll101/OldFatGuy_photos/DodgeAvatar.jpg
Reply With Quote
  #13  
Old 07-10-2013, 10:22 PM
ahsnowlover ahsnowlover is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 99' dodge dakota
Location: Milliken, Colorado
Posts: 256
https://www.facebook.com/anthony.hatch ahsnowlover ahsnowlover
Default

As for your o2 sensor just buy 2 18mm non foulers drill one out to 1/2 in and attach them to the sensor and put it back in the pipe, that will take care of your CEL light.
__________________
99' 3.9 Dakota SLT 4x4,200K+ miles, Pioneer DEH-P8400BH HU, 2" suspension lift, 55watt 6000k bi-xenon hid conversion, 31x10.50x15 Toyo Open Country A/T, airaid TB spacer, spectre air intake, v-8 throttle body, Magna-flow High flow cat with Flow-master 40 series, eventually swapped to a 5.2 v8
Reply With Quote
  #14  
Old 07-10-2013, 10:50 PM
hanleysh hanleysh is offline
Professional
 
Join Date: Jan 2010
Vehicle: 03 Dakota Quad Cab 5.9L
Location: Port Royal PA
Posts: 236
Default

That van is the ****.....hippy
Reply With Quote
  #15  
Old 07-11-2013, 09:46 AM
RollerRed RollerRed is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 98 Dakota
Location: Milton, Wa
Posts: 395
Default

Why do I have to drill one out to 1/2" cant I just buy an 18mm and a 1/2"? I ask because I don't have a drill...was an older one and the motor finally gave out.

My cat is toast, it rattles at idle, under load, and just cruising so I would have to buy a new one if I needed one anyway. I cant think of a time when I would need one considering the only place around me that requires smog is Seattle and I will never live there!

Last edited by RollerRed; 07-11-2013 at 09:49 AM..
Reply With Quote
  #16  
Old 07-11-2013, 11:33 PM
LAKOTA169's Avatar
LAKOTA169 LAKOTA169 is offline
All Star
 
Join Date: Sep 2005
Vehicle: 2005 Magnum R/T, 2000 Dakota R/T, 1937 Plymouth Business Coupe
Posts: 929
Default

Quote:
Originally Posted by hanleysh View Post
That van is the ****.....hippy
**** carpet over 2" of foam, long white fur, red crushed velvet, bed covered in short red fur, 2'x4' mirror on ceiling, and black light. Perfect for the drive in movies. Also had a sink and icebox.


__________________
Caution: Detroit may be hazardous to your health.

Law Enforcement: Sworn to protect your butt, not kiss it.
Reply With Quote
  #17  
Old 07-12-2013, 08:58 PM
ahsnowlover ahsnowlover is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 99' dodge dakota
Location: Milliken, Colorado
Posts: 256
https://www.facebook.com/anthony.hatch ahsnowlover ahsnowlover
Default

You have to drill the inside out to 1/2 so the end of the sensor will go through it. The sensor is a 18mm hole but the inside isn't. If you look at them you'll understand why it's necessary to drill out the inside to 1/2.
Reply With Quote
  #18  
Old 07-12-2013, 09:09 PM
RollerRed RollerRed is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 98 Dakota
Location: Milton, Wa
Posts: 395
Default

That sucks...As I don't have a drill! Gonna have to think of something here...Any Idea's?
Reply With Quote
  #19  
Old 07-13-2013, 05:19 PM
RollerRed RollerRed is offline
Veteran
 
Join Date: Oct 2011
Vehicle: 98 Dakota
Location: Milton, Wa
Posts: 395
Default

Ok so from my research most trucks before 2000 you can just zip tie the rear O2 sensor up to the frame and it wont cause any CEL's or problems. I guess as long as the rear is a lower temp then the front it is fine. Works for me! So I will cut out 18" of pipe (cat + rear O2 sensor bung) and get some pipe connectors and slap it together. About $22 after everything is said and done. Wish me luck! Gonna do this on Wed morning this coming weeks.
Reply With Quote
Old 07-13-2013, 05:19 PM
 
 
 
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 08:38 AM.

Internet Brands, Inc.


Contact Details & Emails