3rd Cat

[hdh95]

Hi, I have been trying to find the answer but no luck. I was wondering if i left the 3rd cat and got off road down pipes will i still pass inspection?

 

[Linemonkey]

That depends on what kind of tests they run, what state you're in and, in some cases, what county

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[krewat]

What state are you in?

Here in New York, you could probably get away with it, as the inspectors are private mechanics, but in California, say, I doubt it And even here in New York, they might get a little particular about that kind of thing. If it looked stock, with no obvious welds like "Oh, it's obvious someone cut the cat out" I doubt it would be an issue (here in New York, that is)

 

[hdh95]

I live in texas. I also know that they can tell if they o2 sensors are turned off and thats what they do for the tunes for catless down pipes right?

 

[Linemonkey]

I'm in Texas as well. It depends on the county, here. I'm in Gaines county, so I pull in, they check my lights and insurance and send me on my way. Now, large cities in Texas, I really don't know.

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[SilverSH0]

I live in texas. I also know that they can tell if they o2 sensors are turned off and thats what they do for the tunes for catless down pipes right?

I would imagine that if you remove the main cats then it will throw a rear O2 sensor code (or you have them turned off). If you're in an area where they check for that then my guess is you would fail. If you're in an area where they only do a visual inspection, chances are you could take it someplace and pass.

 

[hdh95]

Thank you for all the replies i guess im going catted dp lol.

 

[Linemonkey]

Man, I'm on the fence myself. With inspections being pretty lax around these parts, I'm leaning towards non-catted, though. I don't know if there's much power difference between the two...

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[SilverSH0]

Man, I'm on the fence myself. With inspections being pretty lax around these parts, I'm leaning towards non-catted, though. I don't know if there's much power difference between the two...

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You could always get non catted and if they fail, install the stock DP for inspection.

 

[Linemonkey]

What do you have on yours? Is there any merit to what some say about smelling gas fumes on non-catted?

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[SilverSH0]

What do you have on yours? Is there any merit to what some say about smelling gas fumes on non-catted?

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Mine is still stock and likely will remain stock because I'm not looking to do many mods on this car. That said, I've had many vehicles with no cats in the past and have a different car without cats. Personally, I wouldn't call it a gas smell as it doesn't smell like gas to me. But there definitely is a unique odor that I wouldn't want to be stuck smelling in a traffic jam. But driving through town with the occasional red light, I don't have any issues with the smell.

If I was going to get DPs for the SHO I would go catted because it would fit the car type better. I want my SHO to be a bit more refined and not raw.

 

[Linemonkey]

Mine is still stock and likely will remain stock because I'm not looking to do many mods on this car. That said, I've had many vehicles with no cats in the past and have a different car without cats. Personally, I wouldn't call it a gas smell as it doesn't smell like gas to me. But there definitely is a unique odor that I wouldn't want to be stuck smelling in a traffic jam. But driving through town with the occasional red light, I don't have any issues with the smell.

If I was going to get DPs for the SHO I would go catted because it would fit the car type better. I want my SHO to be a bit more refined and not raw.

I appreciate the response. That's exactly what I needed to know. This is my family car, and my wife drives it more than I do. I want to make sure it stays as comfortable as possible. Catted it is

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[6500rpm]

Slightly off subject, but don't they make cheater post Cat O2 sensors? I'm fairly sure the kid next door put them on his Mustang several years ago, he installed a catless X pipe system and I pulled a circuit diagram that he needed to wire it. From what I recall he cut the factory post cat O2 sensor wires (for the connector) and wired in the fake sensor that gives the pcm a flat signal to indicate the cats were present and working properly. In my area, for emissions inspections they just scan the PCM to verify the monitors have all ran and passed. If that's consistent with other parts of the country, all you'd need to do is have a nut to accept the sensor welded to the down pipe and install the cheat sensor. Without it, doesn't it trigger the mil so you run around looking at the check engine light all day?

 

[SilverSH0]

Slightly off subject, but don't they make cheater post Cat O2 sensors? I'm fairly sure the kid next door put them on his Mustang several years ago, he installed a catless X pipe system and I pulled a circuit diagram that he needed to wire it. From what I recall he cut the factory post cat O2 sensor wires (for the connector) and wired in the fake sensor that gives the pcm a flat signal to indicate the cats were present and working properly. In my area, for emissions inspections they just scan the PCM to verify the monitors have all ran and passed. If that's consistent with other parts of the country, all you'd need to do is have a nut to accept the sensor welded to the down pipe and install the cheat sensor. Without it, doesn't it trigger the mil so you run around looking at the check engine light all day?

I know exactly what you're referencing on the Mustang as I used to have those on mine. They are called MIL eliminators and it's a capacitor and resistor wired into the O2 wiring. This created a fake good signal so it passed. My brother-in-law had no cats on his Civic and used some spacer to pull the O2 sensor out of the airflow and that caused his to read good. If the signal the SHO expects is the same as the signal from the Mustang than MIL eliminators might work.

 

[steelgiant5]

Aren't the 02's in the sho wideband sensors? I think to have the engine run properly you need to have them functioning. Maybe install the dummy ones just for inspection


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[SilverSH0]

Aren't the 02's in the sho wideband sensors? I think to have the engine run properly you need to have them functioning. Maybe install the dummy ones just for inspection


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There are front and rear O2's on this and nearly every other modern vehicle. While I don't know specifically for this car, on every other car I know about the rear O2 sensors are simply in place to determine if the cats are good or bad. All the wideband and engine management decisions are determined from the front O2 sensors before the cats. If you think about it for a second it makes sense the rear O2 sensors aren't used for engine management. If they did that then they would be attempting to determine air:fuel ratio based on a measurement that could be off depending on how the cats are performing.

 

[steelgiant5]

Ok, makes sense... I must have missed the rear 02 sensor part. Yes the front ones would control that


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