A custom tuner will surely like to lower the car for any reason. Few of them may even push the suspension units of their car to its limit. Some people rather insanely try to lower it than what it should be.
Your basic suspension system will be composed of progressive spring, leaves, shock absorbers and torsion bars.
Generally, leaves are used in those types of vehicles which carry huge amount of load. So, we can focus more on conventional type of car suspension system.
While driving if you by chance hit a bump or pothole then basically the various springs that are designed are going to recoil. This will help the tires to keep its traction properly on the road so that you can handle the car better.
Some people may even prefer to do lowering of the spring in very cheap and dangerous manner that may involve cutting or clipping the stock spring.
Sometimes, this may result in certain initial savings as there will be no need to buy a lowering spring, camber kit, shock and long steering arm. However, this trade off will come within few weeks' time because the shock will initially be compressed.
Therefore, when you ever hit potholes and bumps, it will compress even little more and may burst.
Also, misaligned arm or camber will result into little uneven wear on your tire. You will be able to see the wear little more on inner side of your tire, since it will look like almost like a V in inverted position, in case you try to look up front.
If you want to lower your tire in the right way then it will mean that you need to buy different types of aftermarket parts that are likely to be little bit pricey.
The next probable question can be about the make or brand that you must buy. You must prefer to buy only OEM aftermarket parts.
Those who manufacture these F100 Lowering Kit parts know the design of the car and have built all these parts in accordance to specifications of the car, and hence perfect fit will not be an issue at all.
However, you must remember while choosing about any particular kit to purchase, always try to buy the one that are specifically meant for street use in case you are going to use the car on street, as this must be a little higher and also softer than any racing kit.
Usually racing suspension kits will be intended for very low to get the center of gravity of the car to make it little more stable. As race tracks usually have even surfaces hence it will be perfect using a too low suspension system.
Few more things must be remembered before going for that lowering kits from aftermarket - first try to take ride on lowered car and get the feel of handling and also the suspension.
Remember that altering your suspension system may give you an uncomfortable ride as the dampening system may be set to difficult position so that your tires may not come into the contact with your car chassis or fenders.