Sounds like a well modified car - you might check the VIN and see if it was owned by a member here on the forum. If it was, they might have some insight on the specifics of the car.

As far as your emissions questions, from the mods you list I can't see anything that would be suspect except for the headers. Depending on what they did to the rest of the exhaust, that would be a concern. Here is a thread that has some members talking about modded cars and emissions testing: https://www.crossfireforum.org/forum...mods-tune.html

As far as additional periodic maintenance is concerned, my opinion is that a car that has been modified like this was built to be driven ... hard. With that comes additional maintenance ... just my opinion.

Good luck!!

RL