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Cotharyus
GenIII
 
10/01/2002
18:28:21
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 Subject: 4.7 Cat wisdom?
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Can anyone provide some insight on why or why not to remove the 3rd cat on a 2001 4.7? No sensors to mess with, etc. For those of you that have removed it, did you gut it and put it back, or did you remove it, and clamp in a straight pipe? I'm open to all sorts of comments and suggestions here, in part so that I can make a choice, and in part so that we have a good collection of ideas about it. Thanks.
2001 QC 4x4, 4.7,5 spd, LSD, K&N Gen II Intake, Robert Shaw 180 Stat, Hanson Industries custom front bumper
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CW
GenIII
10/01/2002
19:10:48
|  RE: 4.7 Cat wisdom?
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Message:
Take it out and put a piece of pipe in. It is a good cheap mod to do. Lets the engine breath. If you get a cat back at the same time you will really know the difference as the muffler is pretty restrictive as well but not as bad as the third cat.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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D
GenIII
10/01/2002
19:38:16
| RE: 4.7 Cat wisdom?
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Message:
my carsound cat seemed to make it pull
harder in the upper RPM's. I think my low end
is hurt by the 3" catback I have. you can just
cut the stock one off, it is right above part of
the transmission mount (?) so its kinda hard
to get in there and weld, but the guy did fine on
mine, he just cut a little extra pipe out and
replaced it.
01 4.7 CC auto 3.92 LS
Dynomax 3" catback, dumped
HO cams, HO intake manifold
ported-polished 68mm TB
180 stat, no clutch fan
airaid intake, DJMdrop 3-6
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dweishaar
GenIII
10/02/2002
01:05:27
|  RE: 4.7 Cat wisdom?
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Message:
i live in cal, so i flanged the cat and the straitpipe so they are interchangeable. e-mail me if you need pics.
One Eyed Fox
The Baja Dak
Have you jumped a dak..........lately?
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D
GenIII
10/02/2002
02:15:41
| RE: 4.7 Cat wisdom?
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Message:
dweishaar:: your truck is badd ass, is it 2wd?
love those fenders. I wish I would have raised
mine, now that the snow is on its way.
01 4.7 club cab
http://photos.yahoo.com/bc/p0intless/lst?.dir=/
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Chris
Dodge Dakota
JOIN HERE
10/02/2002
12:05:26
|  RE: 4.7 Cat Volume?
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Here is my problem: My wife... she has great ears for the way my truck runs... she typically tells me she hates the sound but the day I did the cams (that she does no know about) she noticed it sounded different... then the day I did the intake same thing... Is this something she will hear? I live in CT and should be getting a 2 yr inspection soon... at which point I think the 3rd cat is GONE....
Chris
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dr0p0ff
GenIII
10/02/2002
12:42:34
| me want.. me want!
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dweishaar, did you do it yourself or did you get it done by a muff shop? that's what i was wanting to do but i wasn't sure how much of a pain in the ass it would be to get it in and out
Keep On Truckin!
Sgt G
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brent
Dodge Dakota
JOIN HERE
10/02/2002
16:47:51
| RE: 4.7 Cat wisdom?
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i've got a 2001 4.7 dakota and i have always been wanting to take off the 3rd cat but always woundered if it would mess with my gas mileage or turn the check engine light on,if i take it off could i run true duel exaust with flowmasters turndowns.
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Cotharyus
GenIII
10/02/2002
19:00:01
| RE: 4.7 Cat wisdom?
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Message:
Brent - taking off the third cat could only increase your milage, and it shouldn't do anything to the computer because there are no O2 sensors on it, only the first two....
Chris - I don't know what to tell you yet, it should sound different (I'll know soon, but I couldn't tell you how soon) but then again the only truck I've ever heard with a gutted/removed cat only had one cat to begin with.
2001 QC 4x4, 4.7,5 spd, LSD, K&N Gen II Intake, Robert Shaw 180 Stat, Hanson Industries custom front bumper
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yates-in-DE
GenIII
10/02/2002
19:11:37
|  RE: 4.7 Cat wisdom?
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Message:
Chris,
Hate to tell ya, but yes I think she will notice it. My 4'10" mexican wife noticed from around the building while out side doing yard work.
She came around the corner watched me get out of the truck and asked if i'd snagged the exhaust on something cause it was louder than normal.
Have fun,
MyVW Killer
Lynn
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