[Dezoris]

Well the sound you might be hearing is your shocks hitting the bumpstops from the drop.

Reducing your shocks travel will a drop like that eliminates its abilty to dampen the spring so it sound like you have a noise comming from your shock towers, when you kinda are.

Other than that does this happen when the wheel is straight?
Also are you sure it is not your tires hitting your fender walls?