just out of curiosity...just popped in my mind. how "dirty" would newer vehicles be before all the emission parts in them (right before where the cat hooks up to the down pipe)? it cant be anyworse then the older cars (like 1940's), can it?
some wouldn't be very dirty at all anymore.
one of the easy ways to tell, is to count how many catalytic converters are on a vehicle. the more converters, the dirtier the engine runs. 80's fords used to have 4 cats.....2 on each bank. shouldn't have been necessary, but it is what it is.
it's been a loooooong time since i've checked emissions before the cats. not had a need to do so for years.
at the risk of pushing things too far....the entire co2 scare/bs gype is only happening, due to organizations not wanting to lose their entitlements, now that the last hoax has been discovered to be a hoax.
i mean....think about it.....what does co2 do? what lives on co2, and what do those things give us? co2 isn't a bad thing at all, nor is it a pollutant.