150 is a bit ridiculous, I've done 150 in my Z28 but it has a good deal of suspension work, I wouldn't feel safe in a stock car doing that. Anything goes wrong on a public road and good chance you may not walk away from it, if you do maybe not in one big blob like you are now. Track is significantly safer, 36 foot wide of clean sticky track in broad daylight, hopefully paramedics on hand just incase. I have heard of incidents needing people to be airlifted out, it happens.