[Red Mustang Gt 46]

I've had good luck with mine...I guess your state emissions inspections will dictate if it will pass or not. For ex: Md only uses a code scanner for OBD2 (96 +) vehicles, any codes=no pass...no codes=pass.
A visual inspection is not conducted unless there is some suspicion (leaking exhaust, loud exhaust). As far as the sniff inspection, that is usually conducted on OBD1 (pre 96') vehicles.

I would check on how strict your emissions laws and enforcement are.

Basic rule of thumb for emissions is that if it's not factory, it's not legal...there are loop holes in the system though.

To further answer your question, I've passed my emissions with flying colors without any problems at all. Anytime you mod your car, your rolling the dice.

Cliff