I think there all a bunch of idiots, every one of them has a different opinion, my 180 was 15yrs old and i had to take it when i got it. There is that many rules going around, the best thing to do is just visit your local inspection station and they will let you know what to do. When i took my 33 to dickson they asked for the form that i received from the inspection station (paul wyhte automotive) so obviously you need the get cleared from them before you go to dickson.