To hollow cat., or not?
#257290
03/17/09 05:47 PM
03/17/09 05:47 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
I have a 94 5.9 V8 in my truck. I think my catalytic converter is clogged, so I kind of want to hollow it out, because its not as loud as I think it should be, and open up. I'm afraid of triggering the O2 sensor or loosing back pressure, therefore losing power. What do you guys think I should do?
|
|
|
Re: To hollow cat., or not?
[Re: HealthServices]
#257292
03/17/09 06:05 PM
03/17/09 06:05 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
Its in the garage with no transmission. I already have a custom Magnaflow exhaust from the cat back. I am also running headers. Not saying I want it louder, but my father in law was running the same system with manifolds, and was louder. Anyone else hollow the cat, or replace it with a straight pipe, or aftermarket piece?
|
|
|
Re: To hollow cat., or not?
#257293
03/17/09 06:08 PM
03/17/09 06:08 PM
|
Joined: Jan 2003
Posts: 75,082 U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,082
U.S.S.A.
|
Quote:
Its in the garage with no transmission. I already have a custom Magnaflow exhaust from the cat back. I am also running headers. Not saying I want it louder, but my father in law was running the same system with manifolds, and was louder. Anyone else hollow the cat, or replace it with a straight pipe, or aftermarket piece?
Do you have to pass an EMISSIONS TEST ??? You can't just hollow it out . Mopar cats do clog , replace it , get a hi flow cat if you want more flow .
|
|
|
Re: To hollow cat., or not?
[Re: JohnRR]
#257294
03/17/09 06:31 PM
03/17/09 06:31 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
|
|
|
Re: To hollow cat., or not?
[Re: JohnRR]
#257295
03/17/09 06:35 PM
03/17/09 06:35 PM
|
Joined: Jan 2007
Posts: 10,155 A Red State
SNK-EYZ
I Live Here
|
I Live Here
Joined: Jan 2007
Posts: 10,155
A Red State
|
Quote:
Quote:
Its in the garage with no transmission. I already have a custom Magnaflow exhaust from the cat back. I am also running headers. Not saying I want it louder, but my father in law was running the same system with manifolds, and was louder. Anyone else hollow the cat, or replace it with a straight pipe, or aftermarket piece?
Do you have to pass an EMISSIONS TEST ??? You can't just hollow it out . Mopar cats do clog , replace it , get a hi flow cat if you want more flow .
If you have to deal with emissions, get a high flow cat. If there's an Oxygen sensor after the cat more than likely it's going to trip a fault code if you eliminate the cat.
Factory Mopar cats are fairly restrictive so any aftermarket cat will probably flow more especially if you get a high flow one.
If you want it louder you alot of people leave on the cat and get rid of the muffler. It gives you a throaty glass pack like sound, but not as raspy.
Kayse can't keep up at all now. lol
|
|
|
Re: To hollow cat., or not?
[Re: SNK-EYZ]
#257296
03/17/09 07:03 PM
03/17/09 07:03 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
So getting rid of it all together is no good? Lose hp?
|
|
|
Re: To hollow cat., or not?
#257297
03/17/09 07:39 PM
03/17/09 07:39 PM
|
Joined: Oct 2005
Posts: 9,065 Milwaukee, WI
In_The_Pink
master
|
master
Joined: Oct 2005
Posts: 9,065
Milwaukee, WI
|
Quote:
So getting rid of it all together is no good? Lose hp?
Replace it with a DynoMax Super Converter or similar and be done with it.
|
|
|
Re: To hollow cat., or not?
#257298
03/17/09 08:07 PM
03/17/09 08:07 PM
|
Joined: Jan 2003
Posts: 17,862 albany ny
05dakota
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 17,862
albany ny
|
Quote:
So getting rid of it all together is no good? Lose hp?
no cat wont pass NYS inspection.
|
|
|
Re: To hollow cat., or not?
#257299
03/17/09 08:10 PM
03/17/09 08:10 PM
|
Joined: Nov 2007
Posts: 21,844 Kirkland, Washington
Pacnorthcuda
Too Many Posts
|
Too Many Posts
Joined: Nov 2007
Posts: 21,844
Kirkland, Washington
|
Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
|
|
|
Re: To hollow cat., or not?
[Re: Pacnorthcuda]
#257300
03/17/09 08:40 PM
03/17/09 08:40 PM
|
Joined: Jan 2003
Posts: 75,082 U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,082
U.S.S.A.
|
Quote:
Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
But if it trips a check engine fault and they connect a machine to the truck like they do in other states that have commiefornia emissions stds , NY is one i think , it will not pass , they see the light it fails .
Or in some states it's a visual , they look under the truck , NO cat , no pass .
but it's good for you to give the answer the OP is FISHING for ...
|
|
|
Re: To hollow cat., or not?
[Re: JohnRR]
#257301
03/17/09 08:46 PM
03/17/09 08:46 PM
|
Joined: Nov 2007
Posts: 21,844 Kirkland, Washington
Pacnorthcuda
Too Many Posts
|
Too Many Posts
Joined: Nov 2007
Posts: 21,844
Kirkland, Washington
|
Quote:
Quote:
Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
But if it trips a check engine fault and they connect a machine to the truck like they do in other states that have commiefornia emissions stds , NY is one i think , it will not pass , they see the light it fails .
Or in some states it's a visual , they look under the truck , NO cat , no pass .
but it's good for you to give the answer the OP is FISHING for ...
I am sorry---what part did you or I miss? He said "no emissions on a 94". (????)
|
|
|
Re: To hollow cat., or not?
[Re: Pacnorthcuda]
#257302
03/17/09 08:53 PM
03/17/09 08:53 PM
|
Joined: Oct 2005
Posts: 9,065 Milwaukee, WI
In_The_Pink
master
|
master
Joined: Oct 2005
Posts: 9,065
Milwaukee, WI
|
Quote:
Quote:
Quote:
Quote:
No emissions on a 94.
Hollow it out. I've run test pipes on two different cars with success. At least give it a shot. JMO
But if it trips a check engine fault and they connect a machine to the truck like they do in other states that have commiefornia emissions stds , NY is one i think , it will not pass , they see the light it fails .
Or in some states it's a visual , they look under the truck , NO cat , no pass .
but it's good for you to give the answer the OP is FISHING for ...
I am sorry---what part did you or I miss? He said "no emissions on a 94". (????)
No emissions test for '95 and older in NY state. Still, I suggest you replace it with a high-flow aftermarket cat-con. For $60, your sensors will be happy, you'll be happy, and Mother Earth will be happy.
|
|
|
Re: To hollow cat., or not?
[Re: teflon]
#257305
03/17/09 08:57 PM
03/17/09 08:57 PM
|
Joined: Nov 2007
Posts: 21,844 Kirkland, Washington
Pacnorthcuda
Too Many Posts
|
Too Many Posts
Joined: Nov 2007
Posts: 21,844
Kirkland, Washington
|
Quote:
Metro NYC testing is done with a "sniffer". Upstate is just a visual, if its there physically its ok. Pre '96 does not require NYSVIP to be plugged into vehicle (OBD II only, 96 and later). Check engine light can not be on.
remove check engine light there are ways around 'the man'
|
|
|
Re: To hollow cat., or not?
[Re: Pacnorthcuda]
#257307
03/17/09 09:06 PM
03/17/09 09:06 PM
|
Joined: Dec 2003
Posts: 5,314 Carstairs, Alberta, Canada
dave571
master
|
master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
|
With a 94 it is unlikely that the engine light will come on. I had a 96 full size that the cat had failed completely on(chamber was empty) and no light on. I agree for 60 bucks just replace it. No fear of future emmisions hassels, and better for resale. It won't lose you or gain you any power either way. Modern cats flow quite well. I will ad, I worked on a 03 explorer at work today. It needs cats too. Nearly 1200 cdn for the cats alone. I can see trying tio find a way around that, but not around 60 to 200 bucks
Last edited by dave571; 03/17/09 09:15 PM.
|
|
|
Re: To hollow cat., or not?
[Re: blk00rt]
#257310
03/18/09 01:44 AM
03/18/09 01:44 AM
|
Joined: Feb 2003
Posts: 18,582 Rust Belt, SW PA
Silver70
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 18,582
Rust Belt, SW PA
|
I'd get a high flow cat. I had to replace the one on my ram, the honeycombs inside slid out of place and acted like it was plugged up. It picked up 2mpg and ran alot better... and I mean before I had that problem.
68 Road Runner, 69 Belvedere, 71 Challenger Vert 340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z 66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram
|
|
|
Re: To hollow cat., or not?
[Re: Silver70]
#257311
03/19/09 06:32 PM
03/19/09 06:32 PM
|
Anonymous
OP
Unregistered
|
Anonymous
OP
Unregistered
|
Thanks for the input. Yes we have emissions here in NY, but for 96 and greater. I think what i'm going to do though, is replace it with high flow cat. just in case.
|
|
|
Re: To hollow cat., or not?
[Re: SNK-EYZ]
#257313
03/20/09 02:03 PM
03/20/09 02:03 PM
|
Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
|
Quote:
Quote:
Quote:
Its in the garage with no transmission. I already have a custom Magnaflow exhaust from the cat back. I am also running headers. Not saying I want it louder, but my father in law was running the same system with manifolds, and was louder. Anyone else hollow the cat, or replace it with a straight pipe, or aftermarket piece?
Do you have to pass an EMISSIONS TEST ??? You can't just hollow it out . Mopar cats do clog , replace it , get a hi flow cat if you want more flow .
If you have to deal with emissions, get a high flow cat. If there's an Oxygen sensor after the cat more than likely it's going to trip a fault code if you eliminate the cat.
Factory Mopar cats are fairly restrictive so any aftermarket cat will probably flow more especially if you get a high flow one.
If you want it louder you alot of people leave on the cat and get rid of the muffler. It gives you a throaty glass pack like sound, but not as raspy.
what I did on my old ram, with a Y after the cat and straight pipes (2.25") out the back with 4"dia 18" long tips. sounded awesome. you can get a dual in/ single out universal replacement or a dual in dual out for ~$95 at summit.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
|
|
|
Re: To hollow cat., or not?
[Re: blk00rt]
#257314
03/20/09 02:12 PM
03/20/09 02:12 PM
|
Joined: Jul 2005
Posts: 327 pittsburgh,Pa.
mikepar
enthusiast
|
enthusiast
Joined: Jul 2005
Posts: 327
pittsburgh,Pa.
|
thats a valuable piece of onfo there, do I owe you anything?, I can pay you something in the future when I actualy do this psyc...thanks BLKOrT
Last edited by mikepar; 03/20/09 02:17 PM.
|
|
|
Re: To hollow cat., or not?
[Re: blk00rt]
#257315
03/20/09 03:28 PM
03/20/09 03:28 PM
|
Joined: Oct 2005
Posts: 4,956 WI
Dcuda69
master
|
master
Joined: Oct 2005
Posts: 4,956
WI
|
Quote:
since you dont have emissions, remove the cat and dont worry about it. If you pop a code for the cat then take your rear most o2 sensor and put it in the frame rail. It just looks for clean air, and that will trick the computer to thinking you have a cat on there. I wont say how I know this.
1st off, the OP's trk is a 94,so it's OBDI, no post cat o2 sensor,so no way to monitor cat efficiency=NO CODES. 2nd, your idea of what a post cat o2 sensor does or functions and how OBDII systems function are waaaaaay off base! Be careful giving totally wrong advise!
|
|
|
|
|