there was talk about doing that in Oregon, the politician says that lift kits, that = bigger tires, engine performance upgrades and so on, harm the environment........ HAHAHAH
from what i remember, that bill did not get passed because of the job loss in the automotive aftermarket industry.
that is just what i read in a thread on the diesel truck website that I'm on, so don't take it for gospel......
but as far as lift kits here (BC) any car or truck that is lifted or lowered, 3 inches or more including the hight of the tires, has to be inspected......not that many people do, but thats how it is here......