The engine in mine makes a noise as I'm driving along... there's this pedal thing on the floor and if I press it further, it only gets noisier. Is this normal? There are also these black things on each corner, they seem a bit loose as they turn around and around all the time. I'm thinking of taking it back to see if they can tighten them up under warranty. Also I've found, sometimes when I stop the car, the 500 logo in the middle of them is upside down... this cant be right can it?