Leno doesn't keep them all stock. For example, in an article he wrote for Pop Mechanics, he told about an old car he bought and drove. The stock brakes were so poor than he couldn't stop it a stop lights and he ran some. It scared the heck out of him on hills. He replaced the stock brakes with modern good ones. Of course it took some fabrication to make them fit. He has some very good mechanics on the payroll to figure those things out.
