eliminating all cats - TCCoA Forums
Reply
 
LinkBack Thread Tools
post #1 of 36 (permalink) Old 10-31-2007, 12:02 AM Thread Starter
 
Join Date: Apr 2007
Posts: 173
eliminating all cats

i am looking for a setup that will eliminate all my cats, i have the 95 4.6 and im rebuilding top half of motor. i want to still run single pipe all the way back but i cant find anyone to make me the same setup without cats. any ideas?
mackenziet is offline  
Sponsored Links
Advertisement
 
post #2 of 36 (permalink) Old 10-31-2007, 03:06 AM
Newbie
Moderator
 
master486's Avatar
 
Join Date: Jun 2006
Location: San Diego
Age: 32
Posts: 5,650
It's illegal for any certified shop to do that for you, so either shop around until you find one that will or punch out the cats yourself. Maybe you can tell them it's for offroad or something.

--Chris

DirtyDog Torque Converter For Sale!!
Huge Parts Sale!!

1996 Thunderbird LX
Awaiting some tender deconstruction...
master486 is offline  
post #3 of 36 (permalink) Old 10-31-2007, 05:32 AM
Awaiting E-Mail Confirmation
 
tinman_72's Avatar
 
Join Date: Mar 2004
Location: North GA
Posts: 2,638
The reason they won't do it is that it is illegal to remove them. It is not illegal for them to run pipe without putting on cats. Try removing them yourself and just having them run new pipe.
tinman_72 is offline  
Sponsored Links
Advertisement
 
post #4 of 36 (permalink) Old 10-31-2007, 12:06 PM
 
Join Date: Nov 2006
Posts: 52
That might be a state to state type of law, I don't know. In Illinois, we were told (8 years ago) a car that had a convertor from the factory had to leave the shop with a convertor on it if we did ANY exaust work. This was a Midas and they were pretty uptight about that stuff. Try a mom & pop shop and remember, cash is king. If they don't issue a recipt they never did it haha.

Lorne
Speedracer_m5 is offline  
post #5 of 36 (permalink) Old 10-31-2007, 03:33 PM
Seasoned PostWhore
 
twin turbo 281's Avatar
 
Join Date: Oct 2006
Location: Auburn WA
Age: 35
Posts: 2,631
Send a message via MSN to twin turbo 281
actually legallly even if a shop removes a off road exhaust to say pull a tranny they cannot replace the exhaust system after the work without installing a convertor(s) before it leaves the shop. but some shops really dont follow along

2x95 cougars to the scapper
97 F250 psd 4x4 dd twin charged
48 Gmc Detroit diesel 453t twin sticked
45 Chevy 451 detroit twin sticked
51 Mack A51T restoration
twin turbo 281 is offline  
post #6 of 36 (permalink) Old 10-31-2007, 03:43 PM
 
Join Date: Jul 2005
Posts: 3,180
There's your answer, Cash is King, No Reciepts, and the less law abiding the shop owner is the better...
Southpaw is offline  
post #7 of 36 (permalink) Old 10-31-2007, 08:51 PM Thread Starter
 
Join Date: Apr 2007
Posts: 173
well i have the front part of the exhaust off from where it conects to the exhaust manifolds to just after the third cat. im just wondering if it would be possible to take that piece to a shop and have them cut the cats off and replace with pipe? and if i did have to punch out the cats how do i do that? they seem to be on an awkward angle and as for the third cat (y-pipe) how would i tackle that?
mackenziet is offline  
post #8 of 36 (permalink) Old 10-31-2007, 09:17 PM
 
Join Date: Jun 2007
Posts: 49
Why do you want to eliminate your cats? Just get some high flow cats. I don't even think that they are that great of a restriction.
Natheo is offline  
post #9 of 36 (permalink) Old 11-01-2007, 08:11 AM Thread Starter
 
Join Date: Apr 2007
Posts: 173
well the one on the drivers side looks pretty clogged and i want a better sound from my exhaust. i have flowmaster original 40's on the car and i know if i take the cats off it will really give it that good rumble.
mackenziet is offline  
post #10 of 36 (permalink) Old 11-01-2007, 08:38 AM Thread Starter
 
Join Date: Apr 2007
Posts: 173
well the one on the drivers side looks pretty clogged and i want a better sound from my exhaust. i have flowmaster original 40's on the car and i know if i take the cats off it will really give it that good rumble.
mackenziet is offline  
post #11 of 36 (permalink) Old 11-01-2007, 11:34 AM
Seasoned PostWhore
 
jco1385's Avatar
 
Join Date: May 2007
Location: Mobile, AL
Posts: 3,746
Garage
when i did my engine install, i just cut the downtubes off behind all the cats but before the resonator. called a shop to see if they'd run pipe w/o cats. they said they will not. drove to the same shop. they did it w/o a problem. they just cant tell you that because there is like a 10,000 dollar fine. at least thats what i was told. so just drive to a shop and ask. they'll tell you no on the phone everytime.

1994 Thunderbird - 2000 4.2L M5R2 now has 55k

1995 Thunderbird - 2002 Alum 4.6L SVO - Awaiting transplant... (Parts donor)

1996 Cougar - 2004 3.9L 4R70W - Part-out soon
jco1385 is offline  
post #12 of 36 (permalink) Old 11-01-2007, 10:27 PM
5th Gear Poster
 
94fastbird's Avatar
 
Join Date: Dec 2005
Location: Atlantic, Iowa
Age: 33
Posts: 367
Send a message via MSN to 94fastbird
thats what i did to my exhaust, i took the cats off, brought it into the exhaust shop they ran all the pipe, told me that as long as i take them off they'd do the exhaust they can't get in trouble for that i could though, but here in iowa we dont have to worry about much. dont have state inspections

Current Mods:
balanced & blueprinted block. by my dad & I @ (The Engine Shop INC.) i'm running manley forged i beam rods, forged manely .020 16cc dish pistons, forged 8 bolt crankshaft thats been polished, corba high volume oil pump, block has been align bored & decked. ported and polished early production heads, heads have been milled, 3 angle valve grind, ported exhaust manifolds, gasket matched intake, dual inlet dual outlet dynomax turbo muffler underseat with 3inch turndowns. transmission heavy duty clutches, b&m shift kit, frrp t lock with 373.
Future Mods:
pi swap with some comp cams and the new trickflow intake, high stall torque converter and mark 8 drive shaft, kooks 3/4 lenth headers and xcal2
94fastbird is offline  
post #13 of 36 (permalink) Old 11-02-2007, 05:27 AM
Seasoned PostWhore
 
twin turbo 281's Avatar
 
Join Date: Oct 2006
Location: Auburn WA
Age: 35
Posts: 2,631
Send a message via MSN to twin turbo 281
just gut them if you want. Just go to home depot and find some angled tools to get at the rough angles.

2x95 cougars to the scapper
97 F250 psd 4x4 dd twin charged
48 Gmc Detroit diesel 453t twin sticked
45 Chevy 451 detroit twin sticked
51 Mack A51T restoration
twin turbo 281 is offline  
post #14 of 36 (permalink) Old 11-02-2007, 07:04 PM
5th Gear Poster
 
Beerdog80's Avatar
 
Join Date: Jun 2007
Location: Oklahoma
Posts: 414
Quote:
Originally Posted by twin turbo 281 View Post
just gut them if you want. Just go to home depot and find some angled tools to get at the rough angles.
I just gutted the two up top, put them back in place for 'legal looks' and removed the resonator from the middle. Easy, far cheaper than high flow cats and even those will still clog up at some point in time. Had some on my stang, hit some water..and that was all she wrote.
Beerdog80 is offline  
post #15 of 36 (permalink) Old 11-02-2007, 07:37 PM
Newbie
Moderator
 
master486's Avatar
 
Join Date: Jun 2006
Location: San Diego
Age: 32
Posts: 5,650
Theoretically all cats should last forever, but because there are always rich/lean running conditions (even for less than a second before the PCM adjusts the A/F ratio) and eventual problems with a sensor or two (like a wearing oxygen sensor or dirty/faulty MAF), they will enivitably be destroyed.

--Chris

DirtyDog Torque Converter For Sale!!
Huge Parts Sale!!

1996 Thunderbird LX
Awaiting some tender deconstruction...
master486 is offline  
post #16 of 36 (permalink) Old 11-02-2007, 07:42 PM Thread Starter
 
Join Date: Apr 2007
Posts: 173
how did you gut them?, they seem almost impossible to get into
mackenziet is offline  
post #17 of 36 (permalink) Old 11-02-2007, 10:26 PM
Veteran Poster
 
dwinthrup's Avatar
 
Join Date: Aug 2005
Location: mn
Age: 36
Posts: 825
use a cut off tool and cut the shield off and then cut in in half the long way and cut that section off punch them out with a hammer and a pry bar weld the side back on and the heat shield. ware a dust mask too!

93 LX: 89 SC rear sway, Tokico drop kit, JBA headers,ported and polished Edle Brock intake,ported e7's, E303 cam, Cold air intake,75mm TB,03 Lmaf, TwEECed T4M0, smog pump & ac delete, under drive pulleys, msd 6a, 1.7 ratio roller rockers, electric fan, 3.27 trac lok, 5spd, aluminum drive shaft, digital cluster converted to analog and it works!
dwinthrup is offline  
post #18 of 36 (permalink) Old 11-03-2007, 03:39 PM
5th Gear Poster
 
Beerdog80's Avatar
 
Join Date: Jun 2007
Location: Oklahoma
Posts: 414
Quote:
Originally Posted by dwinthrup View Post
use a cut off tool and cut the shield off and then cut in in half the long way and cut that section off punch them out with a hammer and a pry bar weld the side back on and the heat shield. ware a dust mask too!
Thats about it. I undid the flange bolts and then cut the weld. Was not really all that hard and didnt take much time since I had access to a car lift.
Beerdog80 is offline  
post #19 of 36 (permalink) Old 11-03-2007, 05:15 PM
Seasoned PostWhore
 
twin turbo 281's Avatar
 
Join Date: Oct 2006
Location: Auburn WA
Age: 35
Posts: 2,631
Send a message via MSN to twin turbo 281
i just used some angled tools and ti took the better half of a day to do it

2x95 cougars to the scapper
97 F250 psd 4x4 dd twin charged
48 Gmc Detroit diesel 453t twin sticked
45 Chevy 451 detroit twin sticked
51 Mack A51T restoration
twin turbo 281 is offline  
post #20 of 36 (permalink) Old 11-04-2007, 07:46 AM Thread Starter
 
Join Date: Apr 2007
Posts: 173
how can i ensure that the angles that the cats are on will be welded exactly where they need to be after i cut it off?
mackenziet is offline  
post #21 of 36 (permalink) Old 11-04-2007, 07:51 AM
Seasoned Veteran Poster
 
BLittle500's Avatar
 
Join Date: May 2006
Location: Newville, PA
Age: 33
Posts: 903
Last year, when I gutted the cats out, I just drilled a big enough hole to get my punch straight through the cat (like going from the engine to the rear), then once I got it all knocked out, I just welded a small piece of steel to patch the hole.

This year, I took my Y-pipe down to the local midas, told them what I wanted, and that it was going on a race car (which mine honestly was, but I guess you could fib if you wanted) and they made me up two down pipes to the length I wanted.

Brandon

BLittle500

2008 Racing Shirts Are In!!!

1995 Ford Thunderbird LX 4.6L (Race Car)
1994 Ford Thunderbird LX 4.6L (2009 Race Car)
2003 Ford F-250 Superduty 5.4L (Daily Driver) FOR SALE
2004 Honda CBR600RR uhhh 0.6L (Sh!ts & Giggles)

1995 LX Dirt Oval Race Car
BLittle500 is offline  
post #22 of 36 (permalink) Old 11-04-2007, 08:37 AM
Seasoned PostWhore
 
Traveler's Avatar
 
Join Date: Feb 2003
Location: Chandler AZ
Age: 56
Posts: 9,165
Garage
Send a message via Yahoo to Traveler
I just took my cats off of the manifolds along with the exhaust pipe to where it reaches the bottom of the car. Then I took both of them to an exhaust shop and asked them to use them as "templates". Bend new downtubes with the same angles and bends as the downtubes with cats, just no cats. Then I put the new downtubes on myself. There isn't any law about exhaust shops bending pipes.


1997 Thunderbird Sport
Low Miles
Wifes Car
destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
<<< SOLD >>>
Traveler is offline  
post #23 of 36 (permalink) Old 11-04-2007, 08:55 AM
PostWhore
 
V8ThunderCat's Avatar
 
Join Date: May 2007
Location: Cisco, TX
Age: 39
Posts: 1,100
After taking my y-pipe off I had no problem gutting the first 2 cats but the 3rd one is another story. Luckily someone had already replaced that with a strait pipe so I had it easy. When I gutted the 2 cats all I used was a long pry bar and a good sized hammer. Once in a while I got the pry bar jammed in there and I had a hard time pulling it out but after about 45min of whacking the cats seemed to be empty. Now all I wish I could do now is replace the resonator with a strait pipe but that can wait until I find a job.

-Randy-
V8ThunderCat is offline  
post #24 of 36 (permalink) Old 11-04-2007, 12:26 PM Thread Starter
 
Join Date: Apr 2007
Posts: 173
so could i use a metal cutting wheel and score a line in the pipe on two sides so i know exactly where it need to go back together and then cut the cat off and split with the metal cutting wheel and gut and reweld back together?
mackenziet is offline  
post #25 of 36 (permalink) Old 11-04-2007, 12:59 PM
Seasoned PostWhore
 
twin turbo 281's Avatar
 
Join Date: Oct 2006
Location: Auburn WA
Age: 35
Posts: 2,631
Send a message via MSN to twin turbo 281
i would go with the idea of cutting a hole on top and then welding a panel on to cover it up.

2x95 cougars to the scapper
97 F250 psd 4x4 dd twin charged
48 Gmc Detroit diesel 453t twin sticked
45 Chevy 451 detroit twin sticked
51 Mack A51T restoration
twin turbo 281 is offline  
post #26 of 36 (permalink) Old 11-04-2007, 01:36 PM Thread Starter
 
Join Date: Apr 2007
Posts: 173
hmmmmm so i should maybe cut a whole in the pipe between the cat and flange that meets the exhaust mani and punch out the cat that way? i still will need to separate the third cat from the whole setup in order to get all the ceramic out correct? why does ford have to make everything so freakin hard lol!
mackenziet is offline  
post #27 of 36 (permalink) Old 11-04-2007, 02:03 PM
Seasoned Veteran Poster
 
BLittle500's Avatar
 
Join Date: May 2006
Location: Newville, PA
Age: 33
Posts: 903
Mackenziet, I'll grab some pics of my old Y-Pipe, I think I still have it, I'll show where I drilled through and re-welded. Once you get the cat knocked out enough (small enough pieces) you should be able to dump most of it out of the pipe where it meets the manifold.

Brandon

BLittle500

2008 Racing Shirts Are In!!!

1995 Ford Thunderbird LX 4.6L (Race Car)
1994 Ford Thunderbird LX 4.6L (2009 Race Car)
2003 Ford F-250 Superduty 5.4L (Daily Driver) FOR SALE
2004 Honda CBR600RR uhhh 0.6L (Sh!ts & Giggles)

1995 LX Dirt Oval Race Car
BLittle500 is offline  
post #28 of 36 (permalink) Old 11-04-2007, 04:19 PM Thread Starter
 
Join Date: Apr 2007
Posts: 173
much appreciated thank you
mackenziet is offline  
post #29 of 36 (permalink) Old 11-04-2007, 05:41 PM
 
Join Date: Jul 2005
Posts: 3,180
Quote:
Originally Posted by Traveler View Post
I just took my cats off of the manifolds along with the exhaust pipe to where it reaches the bottom of the car. Then I took both of them to an exhaust shop and asked them to use them as "templates". Bend new downtubes with the same angles and bends as the downtubes with cats, just no cats. Then I put the new downtubes on myself. There isn't any law about exhaust shops bending pipes.
That makes a hell of a lot more sense then trying to gut them and reuse the shells...
Southpaw is offline  
post #30 of 36 (permalink) Old 11-05-2007, 08:29 AM
Seasoned PostWhore
 
jco1385's Avatar
 
Join Date: May 2007
Location: Mobile, AL
Posts: 3,746
Garage
if you have no inspections (such as AL, and FL) just get downtubes made w/o cats. it's fairly cheap enough, and not a pain in the a$$

1994 Thunderbird - 2000 4.2L M5R2 now has 55k

1995 Thunderbird - 2002 Alum 4.6L SVO - Awaiting transplant... (Parts donor)

1996 Cougar - 2004 3.9L 4R70W - Part-out soon
jco1385 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TCCoA Forums 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











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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