Whats wrong with a body kit?
Ahem.....
A body kit was originally design for race car that needed full air dynamics in their races. A body kit is suppose to cut the air in certain ways to help the car maintain balance at hight speed in the specific types of racing..
Also the material used must be strong and not and I MEAN NOT flex one tiny bit or else at high speed that will throw the air patterns off.
Now then for the greed of money and looks people have come to make them for regular cars.. SOME of the air pattern kits do work, but the majority of the kits just are for looks and they are not even sturdy enough to do its job. If you look dead on at a car with the kit you will notice it has created even more restriction because although they have a kit on, the flow through the kit is usually stop with a fender cover or a bunch of wires and crappy stuff. That makes the kit useless.
Also if you ever sit in a car with a horrible made kit, you will notice at high speed the car rocks and the kit squeaks back and forth.... thats because the kit is made and installed so poorly that at speeds, its moving back and forth...
Again there are only a few kits out there that really does its job.
Thats why a lot of people go for lip kits. Some lip kits cut airs too, while others are to make the car look as low as possible for a VIP look type.
Again only some cars with the kit actually does its job. its hard to tell unless you study the layout of the kit on the car.
this.... Yes at high speeds.
This.. no at high speeds
This yes
This yes
This Yes
This no....