Can U pass emmissions without a Cat?
Thread Starter
Drifting
Joined: Aug 2000
Posts: 1,251
Likes: 0
Re: Can U pass emmissions without a Cat? (Z-PDX)
I pass the visual because mine is gutted.
I should have mentioned that.
I made the car run cooler by changing the fan switch & thermostat.
So my question is if I make it run hot again but dont replace the Cat. Do you think it will pass?
I should have mentioned that.
I made the car run cooler by changing the fan switch & thermostat.
So my question is if I make it run hot again but dont replace the Cat. Do you think it will pass?
Melting Slicks
Joined: Nov 2003
Posts: 3,375
Likes: 1
From: Northern CA
Re: Can U pass emmissions without a Cat? (nobodyunknown)
My son did about 10 years ago on a 1980 Dodge Colt with a gutted cat.
I think it would be tougher on alater model carw with tougher standards.
I think it would be tougher on alater model carw with tougher standards.
Le Mans Master
Joined: Oct 2002
Posts: 7,178
Likes: 1
From: Bahston Mass.
Re: Can U pass emmissions without a Cat? (nobodyunknown)
Not a furry one.
I want to know if you think a car can pass without having a catalitic converter.
Thanks
I want to know if you think a car can pass without having a catalitic converter.
Thanks
I tried. I failed. :leaving: (not on the Vette)
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
Re: Can U pass emmissions without a Cat? (nobodyunknown)
2 years ago my LT1 did, on the third pass when I demanded a ride along to watch the gauges. I didn't know then the cats were gutted because a previous owner did it. The motor was stock at that point.
This time around with a cam there was no chance of passing. It was so bad I could smell the fumes when the car was idling and the result was high hydrocarbons. I put on Random tech cats plus headers and it passed with flying colors with no tuning work on the engine.
This time around with a cam there was no chance of passing. It was so bad I could smell the fumes when the car was idling and the result was high hydrocarbons. I put on Random tech cats plus headers and it passed with flying colors with no tuning work on the engine.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Can U pass emmissions without a Cat? (nobodyunknown)
It depends on your local laws, year of the car, and sometimes, the inspector. My '84 got through fine, first gutted, then removed. With the laws I live under, the inspector isn't a factor. Good luck, and...
RACE ON!!!
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Can U pass emmissions without a Cat? (boonie2)
in california the answer is a simple NO!
thus in california CAT=NO PASS.
thus in california CAT=NO PASS.
RACE ON!!!
Burning Brakes
Joined: Feb 2004
Posts: 1,229
Likes: 0
From: Kansas City MO
Re: Can U pass emmissions without a Cat? (nobodyunknown)
I live in Kansas City, MO and it passed the inspection last July when I bought the car. It already had dual exhaust pipes installed with no cats.
Race Director
Joined: May 2000
Posts: 17,101
Likes: 4
From: No more yankee my wankee, the Donger is tired!
Re: Can U pass emmissions without a Cat? (nobodyunknown)
Typically if it is in good tune, it will pass the rollers, but not the idle.
I run no cats, then again, I don't have to worry about smog.
I run no cats, then again, I don't have to worry about smog.
Drifting
Joined: Nov 2001
Posts: 1,498
Likes: 0
From: Bucks county Pa
Re: Can U pass emmissions without a Cat? (CFI-EFI)
Mine passes well within specs with the cat sleeved with pipe, so i pass the visual too. If car is in good tune the cat wont be the deciding factor. My truck passes by the skin of its teeth with a cat in place. :smash:
Burning Brakes
Joined: May 2000
Posts: 1,160
Likes: 10
From: Nashville TN
Re: Can U pass emmissions without a Cat? (blk90rdstr)
I failed in AZ with 1 cat on and 1 burnt out. Earlier I had passed an Idle test in TN. I replaced the cat and passed in AZ. Now I have the sidepipes w/no cats, take that AZ :rofl:
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: Can U pass emmissions without a Cat? (nobodyunknown)
I pass the visual because mine is gutted.
I should have mentioned that.
I made the car run cooler by changing the fan switch & thermostat.
So my question is if I make it run hot again but dont replace the Cat. Do you think it will pass?
I should have mentioned that.
I made the car run cooler by changing the fan switch & thermostat.
So my question is if I make it run hot again but dont replace the Cat. Do you think it will pass?
To be honest, I don't believe that removing the cat is worth the cost to the environment vs. the gain in power. Is 5hp worth messing up the air we breathe?
Get some used cats from a corvette salvage yard, or a pair of cheap Walker cats... If you have the $$$ get some Random Tech cats - they are the best.
I am not a tree hugger, but I do like having clean air, and if using a cat is what is required to keep my air clean, then so be it. It strikes me as selfish when people remove the cat just cause they "don't like them".
What's not to like? They are non-invasive, no moving parts... and they do an important job. I would hate to think how our air would look if not for them (for reference, check the LA Basin, circa 1965).
So, do the right thing and reinstall a couple of cats. The power gain isn't worth the energy wasted on this discussion. :rolleyes:
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: Can U pass emmissions without a Cat? (bogus)
There's a million ways to debate this. I used to have a link to an EPA article that said that catalytic converters actually created more O-zone damanging pollution than cars without. So you can take your pick, some smog and acid rain, or no O-zone?
Frankly I don't care one way or the other. I installed headers on my car for the performance gain they give, not just because it gets rid of the cats. I would never remove a working cat from a car just to put a pipe in it's place. Futhermore if they started doing emissions testing in KY and I had to put cats on my car I would gladly do it.
As it sits my car is in perfect tune and I keep it that way. It dumps less pollution into the air than a lot of vehicles out there that people neglect. To make up for my lack of cats I'll just use a rake instead of a leaf blower when the fall comes around.
Frankly I don't care one way or the other. I installed headers on my car for the performance gain they give, not just because it gets rid of the cats. I would never remove a working cat from a car just to put a pipe in it's place. Futhermore if they started doing emissions testing in KY and I had to put cats on my car I would gladly do it.
As it sits my car is in perfect tune and I keep it that way. It dumps less pollution into the air than a lot of vehicles out there that people neglect. To make up for my lack of cats I'll just use a rake instead of a leaf blower when the fall comes around.
Burning Brakes
Joined: Nov 2003
Posts: 844
Likes: 0
From: Cape Cod Ma
Re: Can U pass emmissions without a Cat? (JB666)
Not a furry one.
I want to know if you think a car can pass without having a catalitic converter.
Thanks
Not in MA, by no means :nonod:
I tried. I failed. :leaving: (not on the Vette)
I want to know if you think a car can pass without having a catalitic converter.
Thanks
Not in MA, by no means :nonod:
I tried. I failed. :leaving: (not on the Vette)