"They" is the lovely State of California and I am referring to the annual state inspection of all vehicles. I have a buddy with a very nicely tuned WRX STI who has the misfortune of living in CA and his car has LOTS of mods, including tune, catted down-pipes, relocated O2 sensors, etc. In the past, he was able to remove his tune and his car would pass the inspection, including the smog test.
As of this year, he has to remove his catted down pipe and replace it with the factory one because even though the car will pass all of their tests, if the technician can "see" the modification, it is an automatic "FAIL".
What a pain it is to live there....