so i have to do emissions by may, my question is, if anyone has done it yet, am i gonna have to detune my car, including the ECU back to stock, or can i just put the downpipe and catback on and pass emissions?

 

I passed in CA with my mods in my sig. CA not only does the OBDII scan they also do the sniffer at the tailpipe.

 

with a good tune you can probably get by without changing anything

 

don't have a cel and put ur stock cat back in for testing

 

ya, thats wat i was thinking, my tune has to be good, its AMS!

 

Just went today and passed. LITH test station.
Everything in my sig. and currently running a test pipe instead of a H/F during the winter months.
I'll be switching back to H/F cat during summer ( can't stand the smell when my windows are down )

It's nice to know you can have a modded evo, 12's w/ 110+ traps, pick up your kid after school, get groceries drive by the police station w/out getting pulled over for loud exhaust and still pass emissions w/out detuning or swapping stock parts.

BTW: If you have your "check engine" light on or any pending codes in your ecu, you will not pass. If you try to clear the code before you stroll in for testing, you will not pass either because the ecu needs to see 3 out of 4 running parameters. This usually takes 15-20 min.