word of advice - Don't openly talk about any performance mods you may have on your car to the EPA guys. They will happily stand there listening to you tell them all about your lovely boost controller, fuel computer, upgraded fuel pumps, injectors, how much power you make, etc. Then slap a nice orange sticker on your windscreen with 30 days to return the car to stock or get a full ADR47 emissions test done which costs around $2500. They can also instruct vicroads to suspend your registration if you dont comply, and vicroads will just do whatever they are told. EPA has the higher authority.