The aerodynamic body kit on the car is done to give the sporty view and for improving the behavior of the car at high speed.
The body kit of the front bumper is made for better clamping of car chuck incident flow. The body kit of thresholds is made to prevent lateral twists that squeeze the car off the road. Rear bumper body kit is made to prevent air turbulence behind the car, they are also trying to tear off the back of the car on asphalt. A spoiler or wing is made for pressing the rear of the machine.
If you decide to do a body kit for the look, everything is simple: make a kit on car (do not remove the bumper, do not do the holes in the back). If you have decided to improve the ride characteristics, then it is more complex. You must decide the following: will you make global design changes (to carry out air ducts for cooling the brake system, air intakes cut in), in this case, the dismantling of some parts and the cutting of holes in the body can’t be avoided.