I'm a alignment technician at my shop, i would recommend doing one. The reason i say this, is because your "caster", may be a little positive or negative. This measurment, is when the whole strut and wheel assembly is tilded forward, or back. If it's to positive or negative, it may cause a hard pull either left or right, depending if it's to positive or negative. Srry for the long post. :stab:
If you are lowering the car you definately need an alignment. It's best to buy the camber adjustment bolts from your Dealer before you go to the alignment shop. Local area prices are around $100 for a four wheel alignment.