I gaurantee non of the mods you listed will adversly affect your vehicle passing smog, if anyone tells you different they have no business smogging cars. Alot of people don't understand the smog laws but proclaim to be experts. BTW I smog in California-by far the worst emissions state.

 

if someone would "gaurantee" that removing the O2 sensors would not cause you to fail emissions, then California testing is not as hard as people claim. any alteration of O2 sensors, including removing them, are grounds for failure of visual inspection, and not only would i "gaurantee" that it would fail, it would cause your check engine light to come on, which means an ORD2 testing machine will automatcially fail the vehicle. the machine wil not even communicate with the ECU in testing mode if it detects a "check engine" condition.

as for understanding the "smog laws" any removal of factory emission items in pennsylvania are cause for failure. tiny lives in pennsylvania...not california, so i was telling him what would happen were he to come into the shop in which i work. and "non" of my messages began with "well, seeing as how i am an expert on the subject of california emissions..."

technically speaking, vehicles do not produce "smog". vehicles produce hydrocarbons which, when combined with nitrogen oxides, and esposed to sunlight, become "smog".

the term began as fog that was mixed with smoke, generally vehicular emissions, then was given a more scientific description. cars dont produce "fog" either.

so in short, to answer your question, you must have all of the original emission equipment to pass the test. you also fail if your vehicle comes with factory single exhaust, and you convert to dual exhaust. if you were to run headers, you would have to run them through a single convertor by means of a Y-pipe, then through a dual outlet muffler in order to have "dual" exhaust, if your vehicle came stock with 2 manifolds, into a Y-pipe. I also do not claim to be an expert on the layout of factory truck exhaust, but i would imagine you know what i mean with respect to the dual exhaust situation.

 

I,m sorry. I didn't see anywhere he said anything about removing O2 sensors. The only 4.7 bolt-on stuff out there is going to be CARB exempt. California by-far has the most stringent smog progra, if it will pass here, it will pass anywhere. We test on a dyno at 15&25 MPH measuring 5 gas(Nox too). Also is a full visual inspection as well as a functional test on all OBD monitors and EGR systems. Headers/CAT/mufflers, and K&N all have CARB exemptions meaning you CANNOT fail the test for fact that they are present.

 

Thanks again all!

I got a call from one of my hot rodding friends! He had done the same thing to his Chevy and failed the test. He did keep the O2 sensors and CAT. Not sure if he had a High flow CAT or not.

He had to redo his work and replaced from the CAT back with the Flow Master American Thunder kit and passed.

I think my best bet will be to upgrade from the CAT back as well until they settle down what and how they are going to test the emissions. There is already talk on changing the specs.

[] I will have to wait on the new headers for now. /thanks for the Info All!

Thanks for the info