Pretty soon all underwear sold in CA will require a catalytic converter. You'll need to be extra careful not to get them clogged up in the event of a shart.
Those California model Hanes aint cheap!!
Seriously though, r/c 4 strokes have lube in the fuel just like 2 strokes, typically use a higher oil content, and have higher combustion temps, so they actually smoke more than 2 strokes.