lowering the car

How low are you going? Depending on the answer to that question, you may need new shocks and struts and very possibily caster/camber plates if you go really low. See my sig.
 
I would suggest a god set of shocks and struts, caster/camber plates, and urethane spring isolators. I'm not sure if a bumpsteer kit is necessary with the BBK's.

For example, I am getting ready to install...BBK specific rate springs, Bilstein shocks/struts, Maximum Motorsports caster/camber plates, prothane spring isolators, and prothane steering rack bushings.