New to the SF bay area, and a few years old for the central valley, and southern cal.. they put your car / truck on what ammounts to a treadmill, and run it up to 50mph or somthing, under load.. to see what the emetions are at crusing speed.. the results are electronicly send to DMV.. about the only way i could see you skirting it is to have somone with the same model truck, do the test for you (and paying off the tech).. If it plugs into the OBDII (which I think it does) then you are sunk..I will tell you next May when mine is due..