basically i am gonna swap a 05 sti motor and tranny into my 02 wrx and found that the hydra ecu will be the easyet way to do it, and i need to find out by using the hydra will it pass CA smog i searched and found nothing

thanks

 

If the Hydra has some way of tricking OBDII then yes, otherwise no I doubt it would pass.

 

No it won't, because it has no OBD-II interface. You will need an unmodified 2005 STi ECU running your engine to pass CA smog.