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Nick
Dodge Dakota
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3/17/2003
16:32:04
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 Subject: PASSING INSPECTION WHEN YOU CUT THE CAT?
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How do you pass the inspection when you cut the catalytic converter? My thought would to hollow out the cat then cut it in half and weld it to the outside of the straight pipe. Any other thoughts?
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Jim
Dodge Dakota
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3/17/2003
16:36:28
|  RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Just get a good highflow cat that way you dont have to worry about anything at all. I have a carsound and have no problem passing inspection with it and its a great cat., performance wise and sound.
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Joe
Dodge Dakota
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3/17/2003
16:52:56
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Don't quote me on this, but I think they will be able to tell by the welds. Once they notice the welds, all they would have to do is tap on it to figure out it's hollow.
Funny thread about cats:
https://www.dodgedakota.net/boards/gen/11120.html
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Joe
Dodge Dakota
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3/17/2003
16:54:46
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Don't they test for emissions also? You will probably fail that miserably.
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Demon Dakota
DakotaEnthusiast
3/17/2003
19:25:12
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Just the straight pipe through the cat...and no, if they do a sniffer test, you'll most likely fail miserably.
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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Nick
Dodge Dakota
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3/18/2003
15:06:18
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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But I heard people who pass the sniffer test with out a cat
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Demon Dakota
DakotaEnthusiast
3/18/2003
15:09:25
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Maybe if they pay the person off who is running the station...
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
|
Chris
Dodge Dakota
JOIN HERE
3/18/2003
15:31:06
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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When I did my emissions, 3 cats, I passed and barely registered anything on the meter, so without the third I would assume you would also pass, that is if you have 3, if you only have 1 I doubt you would pass without it.
Chris
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Nick
Dodge Dakota
JOIN HERE
3/19/2003
15:12:57
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Why do you need three cats? Wouldn't that reduce power?
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Demon Dakota
DakotaEnthusiast
3/19/2003
15:41:28
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Message:
The third (Primary) cat is the one that does all the work when the engine is warm. When you take your truck in to get it tested, it's usually warmed up...so where do you think the unburned fuel is going? Out the tailpipe as increased emissions.
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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silver02
Dodge Dakota
JOIN HERE
3/23/2003
22:21:35
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Message:
The infamous third cat is no thrird cat at all. The third cat is really a resonator. It has nothing to do with emissions. I removed mine today and replaced it with a straight pipe. Before and after emissions test were the same(passed with flying colors). The dodge tech that was working on my truck told me about this mod and showed me the part number for the resonator. It cost me about $40 and two hours to do the whole thing. Twenty bucks was to rent a sawsall. Best money spent on a mod to date.
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handi2
GenIII
3/23/2003
22:32:48
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Message:
I guess if you have 3 cats the 3'rd one may not be one at all. If it has no 02 sensors.
My 02 4.7 has one catalytic converter. With 02 sensors before and after.
2002 Quad Cab SLT Plus 4.7 Every Available Option
Bed Rug/Access Tonnoue Cover/Roadmaster Suspension/HO Cams
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slow r/t man
Dodge Dakota
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3/23/2003
22:34:56
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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I've got a Random 3" cat and 3" flowmaster delta flow. Its loud as hell!!! I'd keep the cat on. A little back pressure is a good thing, especially for torque. I bet their's more backpressure in most mufflers than there is in cats anyway.
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Demon Dakota
DakotaEnthusiast
3/24/2003
12:13:40
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Message:
handi2, if that's the case it would kick as$. I need to go talk to my local Dodge dealer and see if it's called a catalytic converter or a resonator. I could be legal after all...
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
|
Matt
Dodge Dakota
JOIN HERE
3/24/2003
17:28:56
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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I have an 02 R/T with the 3 cats, well two now, my best friend is a huge car nut and knows damn near everything, he also concluded that it was a resonator so im not worried at all lol
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Brett A
Dodge Dakota
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3/24/2003
21:07:28
|  RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Did you notice a sound difference w/ the 3rd cat cut off? Also did your low end torque drop off?
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silver02
Dodge Dakota
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3/24/2003
22:22:00
|  RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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just took my first road trip. There is no noticeable dropoff in torque. There is a noticeable gain in midrange hp. Also it is louder at idle and take off but quieter cruising at 80. I'll check gas mileage on the way back but I think it is going to be better.
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handi2
GenIII
3/24/2003
23:25:44
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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As posted earlier, my 02 4.7 has one cat located by the tranny. It has 02 sensors before and after. Purchased in Florida.
There seem to be some late model 4.7's with different setups. Some with pre-cats and the 3'rd cat (or resonator it seems). And some with just one.
If you have 3 and the third one has no 02 sensors before and especially after. It probably is not a catalytic convertor at all.
Someone cut one in half and end the mistery.
2002 Quad Cab SLT Plus 4.7 Every Available Option
Bed Rug/Access Tonnoue Cover/Roadmaster Suspension/HO Cams
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Matt
Dodge Dakota
JOIN HERE
3/25/2003
01:25:55
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Message:
I noticed no loss at all, if so, it was so tiny it wouldnt make much of a difference, and the tone didnt get necessarily louder, just deeper, meaner if you will, and taht 10 series just makes it sound gorgeous, not for the old or faint of heart
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Demon Dakota
DakotaEnthusiast
3/25/2003
16:37:04
| RE: PASSING INSPECTION WHEN YOU CUT THE CAT?
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Message:
handi2, mine is an early '02 4.7L. Who knows why they mix and match the exhaust like they do...
2 precats, 1 removed third "cat" or "resonator"
True duals...
K&N Drop in AF (CAI during summer months)
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
14.52@94.2 MPH at Silver Dollar Raceway
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