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Re: To hollow cat., or not?
[Re: blk00rt]
#257310
03/18/09 01:44 AM
03/18/09 01:44 AM
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Joined: Feb 2003
Posts: 18,582
Rust Belt, SW PA
Silver70
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 18,582
Rust Belt, SW PA
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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
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Re: To hollow cat., or not?
[Re: Silver70]
#257311
03/19/09 06:32 PM
03/19/09 06:32 PM
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Anonymous
OP
Unregistered
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Anonymous
OP
Unregistered
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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. 
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Re: To hollow cat., or not?
[Re: SNK-EYZ]
#257313
03/20/09 02:03 PM
03/20/09 02:03 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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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)
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Re: To hollow cat., or not?
[Re: blk00rt]
#257314
03/20/09 02:12 PM
03/20/09 02:12 PM
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Joined: Jul 2005
Posts: 327
pittsburgh,Pa.
mikepar
enthusiast
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enthusiast
Joined: Jul 2005
Posts: 327
pittsburgh,Pa.
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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.
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Re: To hollow cat., or not?
[Re: blk00rt]
#257315
03/20/09 03:28 PM
03/20/09 03:28 PM
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Joined: Oct 2005
Posts: 4,956
WI
Dcuda69
master
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master
Joined: Oct 2005
Posts: 4,956
WI
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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!
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