cutting off last cat - Ranger-Forums - The Ultimate Ford Ranger Resource


General Ford Ranger Discussion General discussion of the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 09-22-2009
rizoss16's Avatar
Member
Thread Starter
 
Join Date: Nov 2008
Location: CT
Posts: 808
cutting off last cat

How the hell do you get rid of the last cat on an 03 4.0 4wd? there are 4 cats, i want to at least get rid of the last one to get a little more sound. There are two mini cats comming off of each header, the two pipes combine into one cat (with o2 sensor so that one stays), then a SQUARE pipe connecting from that cat to the last cat. ITS SQUARE!! WTF!! I was going to cut it off right before the last cat and run 2 1/2" pipe to my dumped flowmaster, but how do I connect round pip to that square pipe? wtf?
Reply With Quote
  #2  
Old 09-22-2009
zabeard's Avatar
who?
iTrader: (8)
 
Join Date: Nov 2004
Location: IN
Posts: 26,045
its not square its flattened on the one side for clearance if i remember correctly.
Reply With Quote
  #3  
Old 09-22-2009
ranger's Avatar
Member
 
Join Date: Jun 2006
Location: Imperial Beach, CA
Posts: 4,502
keep the cats man.

The first 2 are pre-cats, the first cat is a reduction cat, this breaks down all the crap in your exhause and sends it to the oxidation cat(the 2nd one) and it put the **** that was broke down together with other stuff to make a cleaner exhaust and to lower pollution. Just keep the cat on there. They do not really affect you hp or anything like that.

This is in la-man's terms. i dont feel like typing out all the specifics, it will take to long and no one really cares.

Taking them off is so stupid. just keep them on there. If you want loud ditch the muffler or but a SBC and throw that in.
Reply With Quote
  #4  
Old 09-22-2009
Yellow_edge_4x4's Avatar
Member
 
Join Date: Oct 2008
Location: Bryan, OH
Posts: 723
Didnt someone take the last two cats off and got better MPG?
Reply With Quote
  #5  
Old 09-22-2009
04blackedge's Avatar
RF Veteran
iTrader: (13)
 
Join Date: Jan 2007
Location: Durham, NC
Posts: 23,426
I bet it was from their stock cats being clogged then.
Reply With Quote
  #6  
Old 09-22-2009
ranger's Avatar
Member
 
Join Date: Jun 2006
Location: Imperial Beach, CA
Posts: 4,502
Quote:
Originally Posted by Yellow_edge_4x4 View Post
Didnt someone take the last two cats off and got better MPG?
If the cats are not clogged, then they have a very very minimal restricion on the exhaust flow.
Reply With Quote
  #7  
Old 09-22-2009
TheStig88's Avatar
Member
iTrader: (4)
 
Join Date: Aug 2008
Location: Columbia, Missouri
Posts: 2,120
Meow
Reply With Quote
  #8  
Old 09-22-2009
whippersnapper02's Avatar
RF Veteran
iTrader: (1)
 
Join Date: Sep 2006
Location: Earth, Milky Way Galaxy
Posts: 7,415
I don't get this I need more sound crap. My buddy has 01 3.0 with a dumped chokemaster with all cats in place and it is really loud. My Magnaflow Catback is loud when I punch it. Are you guys deaf or do you want to be the loudest truck(aka a$$hole) on the road?

You want sound buy a V8.
Reply With Quote
  #9  
Old 09-22-2009
HAZZARDJOHN's Avatar
Member
 
Join Date: Dec 2005
Location: Wyoming MN
Posts: 2,400
Loud + V6 = Seriously
Reply With Quote
  #10  
Old 09-22-2009
shadow905's Avatar
Member
iTrader: (10)
 
Join Date: May 2006
Location: Boerne, TX
Posts: 1,997
the first two are just resonators. they arent actually cats. the last two are cats. i wouldnt take them off. just run your pipe right after the last cat and call it a day
Reply With Quote
  #11  
Old 09-22-2009
brianjwilson's Avatar
Member
 
Join Date: Nov 2006
Location: Hillsboro, Oregon
Posts: 3,650
Quote:
Originally Posted by whippersnapper02 View Post
I don't get this I need more sound crap. My buddy has 01 3.0 with a dumped chokemaster with all cats in place and it is really loud. My Magnaflow Catback is loud when I punch it. Are you guys deaf or do you want to be the loudest truck(aka a$$hole) on the road?

You want sound buy a V8.
I had a 40 series flowmaster on my 4.0L ranger and it was plenty loud with all the cats. It droned a good amount on the freeway too. I definitely wouldn't want it louder than that.
Reply With Quote
  #12  
Old 09-22-2009
04blackedge's Avatar
RF Veteran
iTrader: (13)
 
Join Date: Jan 2007
Location: Durham, NC
Posts: 23,426
Quote:
Originally Posted by brianjwilson View Post
I had a 40 series flowmaster on my 4.0L ranger and it was plenty loud with all the cats. It droned a good amount on the freeway too. I definitely wouldn't want it louder than that.
Ditto
Reply With Quote
  #13  
Old 09-22-2009
rizoss16's Avatar
Member
Thread Starter
 
Join Date: Nov 2008
Location: CT
Posts: 808
ya it sounds good, just a few of my buddies have diesels with stacks and straight pipes, and Im always with them, cant hear my truck over theirs, one of them told me to take the cats off, he has a 2500 dodge cummins with no cats or muffler, just straight pipe sounds sick, not that a gasoline engine could ever compare to it, nor could a 4.0 compare to a v8 sound, just kinda wanted a little more.
Reply With Quote
  #14  
Old 09-22-2009
Member
 
Join Date: Apr 2007
Location: Kansas
Posts: 311
Quote:
Originally Posted by rizoss16 View Post
How the hell do you get rid of the last cat on an 03 4.0 4wd? there are 4 cats, i want to at least get rid of the last one to get a little more sound. There are two mini cats comming off of each header, the two pipes combine into one cat (with o2 sensor so that one stays), then a SQUARE pipe connecting from that cat to the last cat. ITS SQUARE!! WTF!! I was going to cut it off right before the last cat and run 2 1/2" pipe to my dumped flowmaster, but how do I connect round pip to that square pipe? wtf?
It is a ( FEDERAL CRIME ) to remove your cats!!!!
Reply With Quote
  #15  
Old 09-22-2009
zabeard's Avatar
who?
iTrader: (8)
 
Join Date: Nov 2004
Location: IN
Posts: 26,045
i removed mine only to gain clearance, but i then installed 50 state legal aftermarket high flow cats. i am not a fan of removing them but in my case it was needed to suspension changes.
Reply With Quote
  #16  
Old 09-22-2009
Hanks Rangers's Avatar
Member
 
Join Date: Sep 2008
Location: Sandpoint, ID
Posts: 821
If someone gained power from removing their clogged cats they are missing out on some more if they would have replaced them it should in theory return back to stock. I run a flowmaster 40 series delta which helps major with the v6 drone i tried running with out a muffler and the truck performed like poo. want more power and sound run headers high flow cats with a cat back.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
thinking if cutting it off joshtank New Ideas 17 01-05-2010 12:55 AM
old black cat got a new ride last night. Old Black Cat General Ford Ranger Discussion 32 11-05-2008 11:35 AM
Cutting Flowmaster Off? SteveOh 4.0L OHV & SOHC V6 Tech 16 10-22-2006 02:06 PM
Cutting off 3rd converter? jimmclrk1 4.0L OHV & SOHC V6 Tech 5 11-07-2005 02:53 PM


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



All times are GMT -6. The time now is 02:54 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.