can you pass smog with a aftermarket bov? or do you have use the stock bov/bypass valve to pass?

 

You have to re-circulate the air you let off back into the airbox, I belive HKS's SSQ and a couple others have adaptors that let you do this... it's an expensive route, and likely not as loud as you'd want it to be.... or it could be without the routing....

Or you could get into an arguement with the smog ref how, a MAP, based system doesn't need this for emissions as it measures pressure and not airflow like a MAF system does.... (God Luck)

 

For an FC you will need to recirc the BOV into the intake tract to be able to pass. Since we are stuck with shitty AFM's, the car will run pig rich when you let off the gas if you were in boost. I'm not all that familiar with how SMOG tests work, but I hope that will give you some info you need. Good luck.

 

i say just swap it back to stock and save the trouble
buying a stock one is cheap also if you dont have it anymore