Headers and Emissions inspection?
Safety Car
Joined: Dec 2004
Posts: 3,565
Likes: 5
From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
If they are not operrating properly they can be removed. Does not say you have to replace with OEM cats.
High flow cats work better and will still pass the OBDII, if the installer and tuner knows what they are doing.
Racer
Joined: Nov 2006
Posts: 294
Likes: 0
From: Vancouver WA
IIRC the wording is more like Removing "PROPERLY OPERATING OEM" cats is against Federal law.
If they are not operrating properly they can be removed. Does not say you have to replace with OEM cats.
High flow cats work better and will still pass the OBDII, if the installer and tuner knows what they are doing.
If they are not operrating properly they can be removed. Does not say you have to replace with OEM cats.
High flow cats work better and will still pass the OBDII, if the installer and tuner knows what they are doing.
Actually, you can replace the CATS all day long (regardless if the originals have failed or not), you can't relocate them farther from the head (and they must be the same type, 2-way or 3-way - OEM or aftermarket). THe close proximity to the cylinder head heats them faster on cold starts so they can do their job properly. This is really only an issue at cold starts.
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
Actually, you can replace the CATS all day long (regardless if the originals have failed or not), you can't relocate them farther from the head (and they must be the same type, 2-way or 3-way - OEM or aftermarket). THe close proximity to the cylinder head heats them faster on cold starts so they can do their job properly. This is really only an issue at cold starts.
Thread Starter
Racer
Joined: Jan 2007
Posts: 353
Likes: 0
From: Huntington NY
IIRC the wording is more like Removing "PROPERLY OPERATING OEM" cats is against Federal law.
If they are not operrating properly they can be removed. Does not say you have to replace with OEM cats.
High flow cats work better and will still pass the OBDII, if the installer and tuner knows what they are doing.
If they are not operrating properly they can be removed. Does not say you have to replace with OEM cats.
High flow cats work better and will still pass the OBDII, if the installer and tuner knows what they are doing.
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Race Director
Joined: Feb 2006
Posts: 11,732
Likes: 15
From: SC
If you want street legal header, buy a set of shorty headers, Callaway offer them. But your not gonna see nearly the same gains you would get from long tubes.
IMO headers aren't the hardest thing to do on these cars. If you do fail an inspection, just swap on the stockers for the re-test.
IMO headers aren't the hardest thing to do on these cars. If you do fail an inspection, just swap on the stockers for the re-test.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
I run LTs with High flow cats. As long as the car has the Cats and passes the OBDII diagnotics, I would bet most places will pass the car.
Or I would also bet most corvette clubs have one or two guys who own an repair / emissions inspection station.
I have used three differnt places, and have had no problmes. and I dont even have mufflers any more, just staight pipes.
As some one mentioned it does take a bit to heat up the cats to get a proper reading.
All the headers are street leagal ( except for CA) and with High flow cats, I have Random Tech, and the headers have the O2 bung locations, should not be a problem.
Putting on shorty headers, with stock cats, and exhaust is a waist of time and money. Better to spend your hard earned money on a differnt exhuast system.
Or I would also bet most corvette clubs have one or two guys who own an repair / emissions inspection station.
I have used three differnt places, and have had no problmes. and I dont even have mufflers any more, just staight pipes.
As some one mentioned it does take a bit to heat up the cats to get a proper reading.
All the headers are street leagal ( except for CA) and with High flow cats, I have Random Tech, and the headers have the O2 bung locations, should not be a problem.
Putting on shorty headers, with stock cats, and exhaust is a waist of time and money. Better to spend your hard earned money on a differnt exhuast system.
Pro
Joined: Sep 2006
Posts: 729
Likes: 0
From: Oceanside N.Y./ Boynton Beach Fl.
Safety Car
Joined: Dec 2004
Posts: 3,565
Likes: 5
From: stafford country, va. Avatar: Me on turn 3 @ Bristol (The World's Fastest Half-Mile)
I run LTs with High flow cats. As long as the car has the Cats and passes the OBDII diagnotics, I would bet most places will pass the car.
Or I would also bet most corvette clubs have one or two guys who own an repair / emissions inspection station.
Putting on shorty headers, with stock cats, and exhaust is a waist of time and money. Better to spend your hard earned money on a differnt exhuast system.
Or I would also bet most corvette clubs have one or two guys who own an repair / emissions inspection station.
Putting on shorty headers, with stock cats, and exhaust is a waist of time and money. Better to spend your hard earned money on a differnt exhuast system.
