Funky Winkerbean: Should school hall monitors be armed with water-jacket cooled machine guns?
As a race car driver I can give you some technical advice on this. Dropping your car raises your Camber (how much the top of your wheels point in or out) if you drop your car too much it can actually make your camber positive which is really bad and can really mess up handling and cause your tires to wear down unevenly. Also dropping your car pushes the center of gravity down and therefore pushing the center of the car down (which is where the axles meet) and this can cause an alignment issue and cause your car to drift to one side while driving. Dropping your car down too much can cause body roll when turning which can cause your car too roll over the side walls of your tires and once again cause uneven wear, however body roll can be fixed with a larger rear sway bar to improve torsion on the springs. If a car is lowered too much the center of gravity can actually be beneath the ground when plotted out, which is very bad and can cause severe handling issues. Generally, you would want at least a 1 inch gap between your wheels and the body of the car, so as to prevent body roll and alignment issues. Two inches sounds like it might be a bit much, but it might work out finesave your stock springs just in case it screws up your handling and camber too much. If you drop your car and you notice that the tops of your wheels tend to point slightly away from the car than your Camber has become positive, which is very bad and this can cause the steering to become very unreliable. As far as bumps go the car would probably take all bumps a bit rougher and you would feel it more, but it would still go over the small bumps fine, but on larger bumps you would want to pay close attention and take it slow so your car does not bog out (when the front end smacks the road).
Michael's, JoAnn's, Hobby Lobby.any crafts store. It will be in the art department, usually near the glue.