just to make things clear, i wasnt referring to the weight saving, but the aerodynamic improvement. i remember reading about a drag car in japan, it was fast, like in the 9sec bracket, and from memory it had an adjustable spoiler, not unlike the factory one, and when changing from full downforce, to none at all, made nearly 1 full second difference, so removing the stock one would make a difference, maybe not that much but its a free gain isnt it