yeah I just passed emissions with no cats here in Phoenix. what did you fail and by how much? here's my check list for emissions.air filter clean, mass air flow sensor cleaned, throttle body cleaned with tb cleaner, clean egr valve, clean Idle air control valve, fresh cap and rotor if they have more then 30k (cheap insurance and I you have ones with a LT warranty then it costs nothing) good low resistance wires, plugs with less then 30k on them and double check gap (also gives you the chance to see how your engine is running based on how the plugs look), clean oxygen sensors (replace every 100k) also check for any vac leaks or exhaust leaks. I also fill up with 1/4 tank 91 octain gas and 32oz of dentures alcohol.