Guttin the cat converter - Off-Road Forums & Discussion Groups
Ford 67-96 F-Series, 78-96 Bronco All discussions of 67-96 F-Series Trucks and 78-96 Broncos

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 01-30-2003, 05:04 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Guttin the cat converter

hey guys,
I was wondering if yall could give me some advice on this. I want to get a better sound out of my exhaust and since my truck has 2 cat converters would it make much difference if I gut one of them? or just simply take one off and just add a piece of pipe in its place. I don't have emmisions in my county yet, but if I ever get emmisions test would it still pass with just one cat converter? Also would this even be worth my time doing, would it even improve the sound enough? and if so would it be better to gut one or just simply remove one? I like to think I know a good amount about working on trucks but I know a ton of you guys know WAY more than i do. And yall really help out alot answering some of my questions. [img]images/graemlins/givemebeer.gif[/img]
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 01-30-2003, 05:19 PM
Old Hand
 
86convert4wd's Avatar
 
Join Date: Sep 2002
Posts: 562
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Guttin the cat converter

I cut the muffler off and ran a pipe out the side. I still have the cats and itsound pretty damn good. The whole "system" cost me like $17 and about 1/2 hour. Freed up a little power and the cops keep eating their dougnuts when i pass cuz they're looking for a Mustang or Camaro. I guess they think all older trucks sound loud. If i do get pulled over i can just say i dont have the $$ for a new exhaust so i had to do it cuz i dont want my kids dying of Carbon Monoxide while driving with the pipe spewing under the cab. Can't remember the sizes of any of the pipes but just test fit them before you leave the store and make sure you know the O.D. of the pipe coming off the last cat. Build it from there. I had mine come outside the frame rails as soon as they arch upwards. On a Bronco thats in a differnet spot then the pickups so make sure you get enough pipe.


Plus gutted cats sound kinda funny. Almost hollow like you're using a 5" pipe on a 4CYL 120HP rusted out 79 nissan or something. Not a ricer sound, doesn't have that crisp raspy tone just hollow.
86convert4wd is offline  
post #3 of (permalink) Old 01-30-2003, 06:47 PM
 
Join Date: Nov 2002
Posts: 334
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Guttin the cat converter

when you gut the cats jsut insert some exhaust pipe or water pipe on the sinide of it and weld it in so it doesnt create a expansion chamber(gives it that hollow sound and makes a power loss), i found a steel rod guts them nicely.
McDerry is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 01-30-2003, 10:29 PM
Mud in my Veins
 
muddybronco's Avatar
 
Join Date: Oct 1999
Location: woooooo pig sooooooie!
Posts: 6,842
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Guttin the cat converter

i did this to my second cat and it helped power a ton, mainly because the 10 year old cat was spent from what i could tell. my first cat wont pass any light through, so i'm guessing it needs to go also, but it's harder to get to. i liked how mine sounded with it gutted and no tail pipe, but with a massively leaky manifold anything will entertain me [img]images/graemlins/wink.gif[/img] The best bet would be to have a new system drafted from the manifolds back, and dont ask what to do because there were several thorough threads on this in the last couple weeks. Read them and you do what they say and you'd be surprised. Thats my plan, I dont like how the pipe rides the tranny anyway, and I'm sure I can do way better than factory as far as sound and performance.
muddybronco is offline  
post #5 of (permalink) Old 01-31-2003, 09:54 AM
Shilo
Guest
 
Posts: n/a
Re: Guttin the cat converter

For the past 3+ years I've run with no muffler and only the stock cats. It's quiet. The cats are that restrictive, or at least muffle sound that well. I just removed my rear most one and could see a pin-hole of light thru it. I'll replace it with a hi-flow unit. I started it for a few seconds without the second cat, and it certainly rumbled much more.
post #6 of (permalink) Old 01-31-2003, 10:58 AM
 
Join Date: Jun 2002
Posts: 469
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Guttin the cat converter

I'll second, ... um third - fourth ... anyway ... I too am running 2 cats w/ no muffler on the big 6 ... it sounds great! (or is that my exhaust leak?)

I am also considering gutting the cats when I swap in the 351 (might be this-coming week!), I figured I'd pound 'em w/ my 4lb sledge & shake the sh*t out of em, but a chunk o' rebar sounds like a good alternative, too.

Oh yeah ... </font><blockquote><font class="small">In reply to:</font><hr />
if I ever get emmisions test would it still pass with just one cat converter?

[/ QUOTE ]
I doubt it, each cat takes a different combination of noxious sh*t out of the exhaust gasses, I'd think both are required.
hitechredneck is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome