You may be bummed... There is no Thornton County, just City of Thornton and it is in the very Northwestern corner of Adams County. Sadly that corner of Adams Co. is essentially in metro Denver, and is part of the emissions testing area. Wish I had better news....
is your car odb1? then it shouldn't be that bad as long as you have all the emissions stuff in place and the right number of cats (at the stricter stations they will actually count them, its on the sticker under your hood).
Like Ali said, as OBD1, they will not 'communicate / plug in' your car, but there will be a visual check for both Catalysts and O2 sensors, beyond that is just a matter of blowing the correct numbers. (i.e. if a USDM TT supra can pass so can you with similar equipment and tune. Keep us posted when you make the transition north!
well the JDM swap wouldn't have any egr stuff on there, so yeah if they check for it and can't find it thats about the only thing I can think of. you could get the egr from a usdm gte and bolt it all on that would probably help in that scenario.