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D
Dodge Dakota
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1/14/2002
20:02:28
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 Subject: catalytic converter on 4.7
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Message:
Does the 2001 4.7 have 3 cats, or are there 2
cats and then a resonator? If it has 2 cats and
a resonator, could I remove the resonator to
increase the sound without affecting my
emissions? I live in california, so it would be
nice to be able to pass smog.
Thanx
D
01/4.7/CC3.55/airaid/Dynomax3"/TBspacer/
JetStage2/DJMdrop3-6/pegleg
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CW
GenIII
 
1/14/2002
20:55:43
|  RE: catalytic converter on 4.7
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It is a cat under there. I just cut mine out today. Not to rub your face in it but the sound increase is great I love the sound. That alone is well worth the $85.00 CDN to get it removed. The higher RPM HP increase is well worth it as well. My truck had a pretty bad flat spot right at about 5000rpm and you might as well switch gears because power is falling fast. Now though it pulls all the way to 5500 no flat spot at all very good upper RPM HP increase. Just what I was looking for. I kept the old cat around just incase they come up with emmissions testing around here.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, roadmaster active suspention
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2THEXTRM
GenIII
1/14/2002
22:11:13
| RE: catalytic converter on 4.7
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CW, you removed the 3rd cat right and put in a straight pipe to Flowmaster? Was it louder with more resonation or just sounded better cuz I don't want the resonation in my head on the highway. I have Flowmaster stainless catback too and have been thinkin about doin it but have hesitated without someone elses experimentation since I have did enough lately:)
Flowmaster stainless cat back, Air Raid CAD and homemade TB connect, Poweraid TB Spacer, Splitfire Plugs
3 inch body and 1.5" block lift, 33x11.50-16's, Superlift Truspeed Recalibrator
Powerslot Rotors, Ceramic Brake Pads
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CW
GenIII
1/14/2002
23:22:32
| RE: catalytic converter on 4.7
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Mine is very quiet on the highway must be the extra speed beacuse at about 30-40MPH and still in third gear it is a little annoying but I just shift to forth. It deepened the sound alot, she growls pretty good. May see if I can get a sound file going but I have a pretty poor mic and lap top sitting in the corner. I will see if it even works.
2001 RC 4.7 5sp 9.25
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat.
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RS
Dodge Dakota
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1/15/2002
21:45:14
| RE: catalytic converter on 4.7
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Message:
CW
Are you running that little cat box? or did you just tie the o2 sensor around the frame. I'm wondering I would like the extra sound like you got but I don't want to deal with any fault codes. I was told my truck would set codes and not run very good if i cut it off.
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Jeffster
Dodge Dakota
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1/15/2002
23:35:26
| RE: catalytic converter on 4.7
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Message:
Hey CW sure sounds as cocky as helll with out that third cat and a straight pipe hey.
It does reverberate loudly on the 1st to 2nd gear shift at high RPM but overall it's mean. I love sound of sheer horror screaming down that tail pipe. I had a guy beside me that has seen the truck around shake his head in approval going up a hill. I dropped the pedal for him and tore up the hill like I was going down. Do you have any steep hills in your area? That's where you really roast the low tourquers badly.
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CW
GenIII
1/15/2002
23:58:37
| RE: catalytic converter on 4.7
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The beauty of it is that there is no O2 sensor behind the third cat only the ones in the Y-pipe.
2001 RC 4.7 5sp 9.25
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat.
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D
Dodge Dakota
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1/16/2002
02:02:58
| RE: catalytic converter on 4.7
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Message:
so wouldnt that make it a resonator, not a
catalytic converter? I always thought O2
sensors were attached to the cats...beats the
hell out of me, I'm just itchin to yank that thing
out of there now! You guys are a bad
influence.
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Gary F
Dodge Dakota
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1/16/2002
06:36:48
|  RE: catalytic converter on 4.7
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Message:
I wasn't sure either if that 3rd thing was a converter or not, because normally like "D" said there are O2 sensors in front of and behind converters. Anyway, mine has to come off, as my Kenny Brown X brace won't fit with that thing there. And, KB neglected to mention that fact, since they obviously didn't test fit the brace first. Hopefully I can convince a muffler shop that it is a resonator.
Gary
'98 Neon R/T
'01 Dak reg cab, 4X2, 4.7L, 5 spd, 3.92LS
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CW
GenIII
1/16/2002
09:03:14
| RE: catalytic converter on 4.7
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Message:
geeze IT IS A CONVERTOR I have it sitting in my shed along with my muffler and tail pipe.
2001 RC 4.7 5sp 9.25
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat.
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Knobbyman
*GenIII*
1/16/2002
09:31:06
| RE: catalytic converter on 4.7
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Take a pic of it .. and spam it to um CW :) Wait a second... who's a Tech in the Dodge shop?
'01 Graphite QC 4x4
4.7 3.55 LSD
http://www.knobbyman.com
----Speed only breaks stuff faster----
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CW
GenIII
1/16/2002
14:25:24
| RE: catalytic converter on 4.7
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I am. I don't have a digital camera ot I would take a picture. I looked this morning when I went to work it is a convertor. I can see the honey comb design in there.
2001 RC 4.7 5sp 9.25
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat.
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D
Dodge Dakota
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1/16/2002
23:00:41
| RE: catalytic converter on 4.7
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Message:
okay im convinced
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01Motorsport
Dodge Dakota
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7/05/2004
00:40:26
| RE: catalytic converter on 4.7
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I'll save a little bandwidth by using this old post. It's amazing to me how many combinations Diamler-Chrysler has come up with for catalytic converters in the short life of the 4.7 engine. One cat in 2000. Three cats and four O2 sensors in 2001. One cat in 2002. I'm not sure about 2003. The 2004 Dak I looked under at the dealer today (hassle-free 4th of July!) had a large cat after each exhaust manifold, followed by O2 sensors. A Dodge tech that I have known for 20 years told me that we will see more rear-drive cars from D-C in the future. One of the main reasons is the placement of the converters closer to the engine for lower emissions results. Because of this, the typical front-wheel drive with have way too high underhood temperatures for drivetrain reliability. I still can get over those huge heaters so far upstream on the '04 4.7's!
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Kowalski
GenIII
7/05/2004
10:32:54
| RE: catalytic converter on 4.7
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Not all 2000s came with one cat; many came with three. Are you saying they put bigger cats in '04s ?
Lead, follow, or get out of the way
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Jay
Dodge Dakota
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7/06/2004
00:57:57
| RE: catalytic converter on 4.7
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My 2003 4.7L has only one large cat right after the Y pipe with an O2 sensor in front and back. If there is no O2 sensor than its not a cat.
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Kowalski
GenIII
7/06/2004
15:29:25
|  RE: catalytic converter on 4.7
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Message:
Sorry, but that's just not true. My '00 has three cats; and there is no sensor by the third cat. Don't believe me ? Reread the thread and you'll see the Dodge tech says the same thing about his '01, set up the same way.
Lead, follow, or get out of the way
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ZenDak
Dodge Dakota
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7/07/2004
10:30:34
| RE: catalytic converter on 4.7
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I'll second kowalski's statement - my '01 4.7 has three CATS - O2 sensors are only around the front two. The third has nothing,,,but it is a CAT.
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TexasTodd
Dodge Dakota
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7/07/2004
11:48:16
| RE: catalytic converter on 4.7
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It's the Cat in the Hat!
oh, sorry, too many childrens books with my son.
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Germ
Dodge Dakota
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7/07/2004
17:33:25
| RE: catalytic converter on 4.7
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It depends on where you are as well. If I'm correct, Cali's got really strict pollution laws, so they have 3 cats. I'm in PA, my 2000 4.7L only got the 1 cat.
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dakvader
Dodge Dakota
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7/07/2004
19:48:43
| RE: catalytic converter on 4.7
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Remove it and Dodge will void your warrenty. Passing the Cal smog laws like passing the BAR exam in California. Think all the smog money and california is broke???????????
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