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Chris
Dodge Dakota
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11/04/2002
11:38:14
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 Subject: replace all 3 Kitty's
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Message:
After last weekends Dyno session I have convinced myself I need more. Specifcally I want to replace the Cats with high flow versions. But my questiosn are does anyone have a P/N and price to replace both precats and the 3rd main cat on a 2000 Dakota 4.7. Can I jsut clamp these or do they have to be welded to be emissions compliant? How mcuh does welding cost?
Chris
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CThomp
Dodge Dakota
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11/04/2002
11:41:44
|  RE: replace all 3 Kitty's
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Are you sure you have 3 cat's? My '00 only has one.
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Chris
Dodge Dakota
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11/04/2002
12:02:48
|  RE: replace all 3 Kitty's
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Yes, bought it in Mass so I needed to get the LEV package, 3 cats... 230HP instead of your 235HP... well stock... ;-)
Crhis
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CThomp
Dodge Dakota
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11/04/2002
12:06:16
| RE: replace all 3 Kitty's
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Ah...try dr. gas. I think they make custom X and Y pipes.
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CThomp
Dodge Dakota
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11/04/2002
12:15:35
| RE: replace all 3 Kitty's
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I'm pretty sure anything cat-related needs to be welded. Mine was.
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Demon-Xanth
Dodge Dakota
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11/04/2002
12:27:47
| RE: replace all 3 Kitty's
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I think in some states it's against the law to remove or replace cats unless they're broken. So you might check to find out if you need to make sure to "accidentally" hit and break the cats while trying to hammer on "something else".
(yeah, the "can't replace" thing sounds stupid to me too)
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CThomp
Dodge Dakota
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11/04/2002
12:55:39
| RE: replace all 3 Kitty's
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Or if you can't find your hammer to repair something else on your dak you can substitute with a good rock. This is a very handy tool for other repairs.
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Chris
Dodge Dakota
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11/04/2002
13:31:17
| RE: replace all 3 Kitty's
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I have 75k miles so if I say that my mileage went way down what are they going to do. Plus Bill White said he knows of a shop that asks very few questions...
:)
Chris
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Dr.Dakota
Dodge Dakota
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11/04/2002
17:15:12
| RE: replace all 3 Kitty's
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Go to your local public airstrip and buy a gallon or two of 110 (blue) low-lead aircraft fuel. Add it when your tank is low, like when its down to 1-2 gallons...that way your lead level will be in the range that the engine will run fine but you will ruin your catalytic converters for sure!
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hemikota soon
Dodge Dakota
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11/04/2002
22:10:41
| RE: replace all 3 Kitty's
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Message:
heck just replace them and hide them in your house if they question it just say you were doing something bottomed out and something punctured your cat they have to see it to get you with anything and who is gonna keep a punctured cat, as for taking all three and putting high flows iwill run into a problem and that is they don't make high flows that will fit into the shape of the 2 that are right at the exhaust manifolds, but from my experience and i have track numbers from both my dodges i have owned you remove a cat and put a high flow in, they run slower then when you leave the cats alone becuase magnum engines run off that back preasure and you start messing with that and it drives the computer mad, i was running 9.90 with my 4.7 4x4 extended cab dakota 5 speed in the (1/8 mile) put the high flow cat on and a flowmaster single chamber racing muffler( a slight bit agianst the law where i live) single inlet duel outlet with aluminized exhaust pipe from the cat back and now my truck run 10.4 in the (1/8 mile) little dissapionted. hint the reason i wanna put the 5.7 hemi in my truck which from the measurements i have obtained on the engine will fit perfectly into the engine compartment. but need to finish my chevy show truck.
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thoughtpolice
Dodge Dakota
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11/05/2002
08:56:08
|  RE: replace all 3 Kitty's
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Message:
can you say, (or spell, or use):
puntuation?
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Demon-Xanth
Dodge Dakota
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11/05/2002
09:10:50
| RE: replace all 3 Kitty's
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Message:
thoughtpolice: I can "punctuation". :)
(so that makes one of us two)
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Chris
Dodge Dakota
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11/05/2002
09:11:58
| RE: replace all 3 Kitty's
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Message:
I there are gains to be had by cutting out (removing) the 3rd cat on a 4.7 why would it be any different to replace all 3 with hihg flow, I would assume this would be about the same amount of backpressure,
How about removign the precats and moving the 2nd O2 sensors to behind the one remaining cat?
Chris
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hemikota soon
Dodge Dakota
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11/05/2002
12:28:33
| RE: replace all 3 Kitty's
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I NEVER USE PUNCTUATION IN THINGS LIKE THIS, AND AT NIGHT TIME I COULD CARE LESS ABOUT SPELLING WHEN I AM TYPING AT NIGHT AFTER 8 HOURS OF WORK AND 4 HOURS OF CLASS. BUT I HAVE TO PUT A CAT IN ITS PLACE BECAUSE IT WILL NEVER PASS THE VISUAL STATE INSPECTION, AND NO HIGH FLOWS DON'T CREATE THE SAME BACK PREASURE, HINT THE NAME "HIGH FLOW", THEY WORK ALMOST LIKE A STRIAGHT PIPE BUT FILTER OUT WHAT THE TREE HUGGERS CONSIDER TOXIC GAS BUT IN RETURN THEY RELEASE SULFUR DIOXIDE WHEN COMBINED WITH WATER YOU HAVE SULFURIC ACID NOW WHICH IS MORE SAFE HUH? BUT ENOUGH ABOUT MY CAT PET PEIVE
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xplikt
GenIII
11/05/2002
12:32:16
| RE: replace all 3 Kitty's
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Message:
/me steals hemikota soon's caps lock and shift keys.
-Mike
http://www.dodgetruckworld.com/xplikt/
2002 2WD RC SLT 4.7L 5spd 3.92 LSD
MBRP Single in/out, straight piped 3rd cat, turndown tip
Hotchkis swaybars and springs
Bilstein custom tuned shocks
Roadmaster Active Suspension
Shaved emblems and antennae
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Chris
Dodge Dakota
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11/05/2002
12:32:26
| RE: replace all 3 Kitty's
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Message:
Damn, no reason to shout!!!!
My theory is that with only the 2 precats (3rd removed) will have the same TOTAL backpressure as a system with freeflow precats and a freeflow third cat. What is your opinion about this?
Chris
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hemikota soon
Dodge Dakota
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11/05/2002
19:42:31
| RE: replace all 3 Kitty's
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Message:
i wasn't shouting, I am a computer aided draftsman, and i was at work when i wrote that. i have to use caps at work because of the drafting, i forgot to turn it off.
my opinion is backed by facts, i still have the 2 cats at the exhaust manifold and a high flow in place of the third, and i lost .45 of a second in the 1/8 because i lost my low end torque. but burn out in 3rd more now too. so the benefits to the exhaust are at top end but with a truck that is restricted top end doesn't do much help, even if yours is programmed not to be restricted you still only top out at a little over 120, that i found out with mine, 4x4 at that fast is scary.
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Demon Dakota
DakotaEnthusiast
11/06/2002
12:22:16
| RE: replace all 3 Kitty's
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Message:
I removed my third cat entirely and went to true duals and stayed at the same TQ and higher HP (this is before I added HO Cams & Intake, IAT Adjuster). 208RWHP, just under 270 RWTQ.
K&N Drop in AF
True Dual exhaust and removed third cat
HO Cams & HO Intake
Modified TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
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