Arh headers with cats wont pass emissions test?

[Grimace427]

is that so? every dyno ive seen the catted headers make only half of what the catless headers make....no way id spend extra money to make less power.

The difference between catted and off-road headers is 5-10rwhp at most. The metallic cats that come with headers don't really do much at all.

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[RubyRedBoost]

That's a big difference...I really don't wants cats on mine, for the power and extra money, but....

catless + corsa xtreme- seems like it would be way too loud for DD

This is exactly why I put my cats back in. Too much rasp and metallic sound on cold starts and the smell of raw gas is bad if stopped for any length of time. I didnt notice any serious power loss as they are only 200 cell anyways.

 

[Kashawy]

is that so? every dyno ive seen the catted headers make only half of what the catless headers make....no way id spend extra money to make less power.

From what I've read everywhere it says the difference is very minimal, so I'm not sure about your dyno numbers TBH.

The difference between catted and off-road headers is 5-10rwhp at most. The metallic cats that come with headers don't really do much at all.

Right there, someone says half the power, and the other says 5-10 rwhp. I went with catted to avoid the fuel smell knowing there will also be a very small loss in power.

 

[phrenetiK]

The difference between catted and off-road headers is 5-10rwhp at most. The metallic cats that come with headers don't really do much at all.

you're kinda right. i was forgetting the car that made so much less was an auto. it still does make a difference even if its only 10whp though, and the hi flow catted header cars are just about as loud

 

[Grimace427]

you're kinda right. i was forgetting the car that made so much less was an auto. it still does make a difference even if its only 10whp though, and the hi flow catted header cars are just about as loud

For a racecar maybe, for a street car having the cats helps at least a little bit. I've gone from factory headers and cats, to off-road pipes, to longtubes with metallic cats. I'll never go off-road again unless I have a DD and the Mustang becomes my dedicated racecar.

 

[Grim12]

You can add NJ to your list as well. After you drive over a camera and they verify you even have cats, they plug into ODBII and check for reediness. If we have the rear O2s "turned off" you fail as they know these system should be operational. Our best bet here is Kooks headers with Green cats and "O2 non-foulers (spacers) between the rear O2's and the pipe. This will usually provide enough heat to not trip the rear sensors but there is no guarantee on 2011+ cars.

NY also works this way as well but I am hearing rumors that they will soon enforce the visual aspect even further. If you have after market exhaust parts and no CARB "soon to just be ARB" sticker they can fail you as well.

It's disappointing to see this but the EPA isn't messing around these days.

What really irks me is there are not longer any safety inspection in NJ. You can roll in with malfunctioning brakes, no rear view or side view mirrors, broken windshield, no headlights ect.. and pass as long as the car shows OBDII readiness. This is Ass backwards IMO...

Really? I don't remember any visual inspection in NJ. I have had my 2003 Maxima inspected several times without a problem. It has no cats at all. Headers (yes headers on a Maxima) and catback eliminating both precats and the main cat. No check engine light so it passed. I'm up again, we'll see what happens.

So what are we going to do when I bring my near future Mustang to you for a header install?

 

[Silver50Pony]

Really? I don't remember any visual inspection in NJ. I have had my 2003 Maxima inspected several times without a problem. It has no cats at all. Headers (yes headers on a Maxima) and catback eliminating both precats and the main cat. No check engine light so it passed. I'm up again, we'll see what happens.

So what are we going to do when I bring my near future Mustang to you for a header install?

What I can't believe is even the green kooks cats which are 49 state approved (no California)and EPA certified are a hit or miss to pass, I understand the 02s are in a different location but with the o2 extensions it should pass easily as long as there's no CEL. Your 2003 must have been in an era where NJ wasn't as strict with emissions. NY just changed back in 2013 for all newer cars after 2008 I believe to make it more difficult to pass

 

[evo8904]

From what I've read everywhere it says the difference is very minimal, so I'm not sure about your dyno numbers TBH.



Right there, someone says half the power, and the other says 5-10 rwhp. I went with catted to avoid the fuel smell knowing there will also be a very small loss in power.

The smell isn't nearly as bad as you think. Plus, are you planning to be stopped in traffic with your windows down all of the time? Smh, honestly, that is the weakest excuse that I have heard. I understand the emissions issue but smell, I say grow a pair...

 

[Grim12]

What I can't believe is even the green kooks cats which are 49 state approved (no California)and EPA certified are a hit or miss to pass, I understand the 02s are in a different location but with the o2 extensions it should pass easily as long as there's no CEL. Your 2003 must have been in an era where NJ wasn't as strict with emissions. NY just changed back in 2013 for all newer cars after 2008 I believe to make it more difficult to pass

The Maxima is OBDII and I've had it inspected for the last 10 years in NJ and it's passed despite having no cats. I guess my point is, when they plug in to the OBDII port, no codes are shown so it passes and I don't remember them ever looking visually for cats.

 

[Silver50Pony]

The Maxima is OBDII and I've had it inspected for the last 10 years in NJ and it's passed despite having no cats. I guess my point is, when they plug in to the OBDII port, no codes are shown so it passes and I don't remember them ever looking visually for cats.

No check engine light equals pass the emissions test, why I don't understand how catted headers don't pass emissions tests. I passed with no cats here in NY in my first car which was a 1985 mustang 5.0 lol. Sniffer said car ran clean, don't know how

 

[daniel_94kg]

For the North Carolina People wondering, basically 2018 or 70,000 miles is when you need to worry about it if you're in one of the counties that even does emissions inspections from what the guy who inspected mine says.


"If your vehicle is light-duty, gasoline powered, three years old or less, and registered in one of the 48 emissions counties (map), it may be exempt from an emissions inspection under General Statute 20-183.2 . Beginning on April 1, 2015, vehicles with less than 70,000 miles and within the "three most recent model years" will receive a safety only inspection. The calculator on this page will help determine if your vehicle should receive a safety and emissions inspection or a safety-only inspection. All new vehicles sold in North Carolina receive a safety-only inspection that is concurrent to the first year of this rule"

 

[RubyRedBoost]

The smell isn't nearly as bad as you think. Plus, are you planning to be stopped in traffic with your windows down all of the time? Smh, honestly, that is the weakest excuse that I have heard. I understand the emissions issue but smell, I say grow a pair...

Yea man breathing noxious fumes is the definition of masculinity.

 

[BCeagle08]

No check engine light equals pass the emissions test, why I don't understand how catted headers don't pass emissions tests. I passed with no cats here in NY in my first car which was a 1985 mustang 5.0 lol. Sniffer said car ran clean, don't know how

If your tuner turns off your Rear 02 sensors you won't experience a CEL (they turned them off so you won't have a CEL), but you also will not pass a modern OBDII emissions test. The OBDII computer can tell that your rear o2 sensors are turned off. Older cars are allowed to pass even if they have a certain number of monitors in "not ready" state, but new cars will not pass in NY if the rear o2 monitors are turned off.

This is the reason that catted headers are hit or miss in New York. If your car is able to run with the rear 02 sensors on without throwing a CEL, you will pass emissions. If your tuner has to turn off the rear 02 sensors to prevent you from driving around with a CEL all the time, you will fail emissions. Some can run without tripping a CEL, some can't. It's hit or miss.

 

[mustang_guy]

Yea man breathing noxious fumes is the definition of masculinity.

Ive had dozens of catless cars over the year. Its not as bad as people make it. Very rarely have i ever smelled anything. Even when standing behind the car its never been so bad i had to walk away. Either some people have a super sensitive nose or they are a candy ass.

 

[RubyRedBoost]

Ive had dozens of catless cars over the year. Its not as bad as people make it. Very rarely have i ever smelled anything. Even when standing behind the car its never been so bad i had to walk away. Either some people have a super sensitive nose or they are a candy ass.

Or the car just plainly sounds better with the race cats in. Im extremely happy with my numbers. I highly doubt I'm down 10-20hp as some claim either. I've personally swapped them out twice. Only difference I noticed was the car actually seemed to run better and cold start volume was reduced. You claiming you cannot smell raw fuel coming from a catless car is bogus.

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