well, in nebraska youll probably be doing midwest spl. so classes depend on the actual power you get from your amps. they will clamp the amps and tell you. the meter goes on the dash, dbdrag style. im pretty sure you can open a door so try the driver door open, or just the window down. putting your visors down might help a little, seat position, glove box open, even ac vents open or closed might make a difference. if you get the time, just play with those things.
how far are you from lincoln?