Anything made in/before 1986 I believe. In CT USA, any vehicle 25 years old or older is exempt.
I think it has to do with Height and Weight rather than age
Taxes on cars are a matter of state and local law. It would depend on the state and locality.
This depends on where you live Where I am yes it exempt now
In CT USA it is exempt.
ontario
It means that the milage is exempt. A car must be 10 years old or older for miles to be exempt.
When it runs on batteries.
A new catalytic converter will help to reduce your car's emissions, you can also take your car to a local garage and have them perform tests on it to see how else emissions can be reduced
No. The muffler is a passive component in the exhaust emissions system.
Laws on this vary by jurisdiction. Without knowing where you're at, we have no way of knowing the laws of where you're at. For the most part, in places where emissions testing is required, a 1999 model year vehicle will not be old enough to be exempt from requiring testing.
The same as in any car.