In CA, we have to smog every car and truck 1976 and newer. I had to smog my '67 GTO in 1997 when it was 30 years old. My 39 year old Toyota truck has to get smogged on a dyno every other year. Still passes with 300,000 miles on it(had to replace the original CAT at 275k miles a few years back).
And, they lower the allowed levels of emissions as the vehicle gets older, so passing is tough. Kind of like having a 20 year old athlete being required to run the 100 yard dash in 10 seconds, but by age 65, he needs to run it in 8 seconds or get sent to the rest home. It's crazy, and used to generate income.
__________________
Jeff 
|