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ok I have a 03 Sentra Limited Ed. and im wanting to put K & N cold air intake, DC sport headers, a nismo cat back exhaust and a throttle body spacer. ive been told that if i do this i wont pass emissions. is this true? and what kind of results should i see if i do put them on? if someone could help that would be great.
 

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2018 Nissan Pathfinder SL
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well my understanding in Texas its just a OBD II check, so so long as it doesn't throw a CEL you should be OK.
So make sure you put the O2 sensors back on, and the intake air sensor.
When you buy this stuff it should tell you if its emissions compliant, meaning has the bung for the O2 etc etc
 

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nothing you listed will affect emissions. as long as you are still using your cat, youll be ok. if theres a pre-cat in the exhaust manifold and you eliminate it, youll have to make sure that the secondary/main cat is fully heated before testing or you will fail.
 
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