Quote:
Originally Posted by OMCUSNR
Sorry, This is NOT TRUE! Removal or tampering with an installed emissions device is a violation of the FEDERAL Clean Air Act, and if you take the cat out, you LEGALLY have a vehicle that can only be used at the drag strip, a tractor pull or on a farm or private ranch. You cannot legally register it for use on a public road, street or highway.
HOWEVER, enforcement is up to each state, and is lax or non-existent in most states, except California, where its about to get stiffer.
OMC
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Well, Okay if you want to get picky,
then any modification to any point in engine operation or control is a violation of emissions rules! That means anything! Reflashing ECM / TCM is illegal, intake, exhaust, egr deletes, block off plates, and so on are ALL illegal. ECM/TCM are emissions control devices by design - any modification is a violation (unless done by manufacturer to address control issues). They build the truck and it "passes" the tests the way it is assembled. Same thing with replacement parts - if the vehicle has not undergone crash testing with those components then the vehicle is not in compliance with law! Lift kits, bumpers, wheels, etc. all change the properties of a vehicle in a crash! As you were quick to point out though - enforcement is up to local authorities!
So if you don't care about warranty issues, and don't have emissions testing or tree hugger issues - then just forget the cat if you want to!
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