First off, it's "OBD," not "ODB."

Testing procedures vary from state to state. Generally however, they go by the model year of your car rather than what sort of computer you have. If you put an older OBD1 computer into an OBD2 car and the smog station looks for such things, they will probably not pass you since the wiring has to either get hacked up or have a jumper harness installed in order to use it.

Every car gets its tailpipe sniffed. Do you have some reason that your car won't pass emissions? The only state where people tend to have any sort of problems is California.