I used to be illegal (big fine) to raise or lower a vehicle more than three inches from factory, tinted windows were banned, loud mufflers were illegal, etc here in Indiana, but either the laws were repealed or they are not enforced any more. Headlights had to be within a certain height range, too -- would make those new SUVs look mighty strange with the headlights under the front bumper!
Canada seems to be much more reasonable about such things.
I expect to see the same restrictions here eventually -- political freedom do not, as I see it, mean no laws! Certainly I have the same right to reasonable decibel limits on a vechicle as the owner does, since his noise impacts on my ears!
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!