Are you building a car for motorsport, rally, drifting, or similar? it is important to get the weight of the car as far down as possible. The advantage of the car not weighing so much is that it accelerates faster, is easier to turn, and brakes better. Below you will find eg door sides in aluminum for eg BMW. These door sides are cut out in the right shape and there is a hole for eg door handles. They are made with reinforcements so they do not bend when mounting, so they always look good. You will also find, for example, floorboards with anti-slip and footstools that you can mount on the passengers so that he can hold on well when driving.