[ihatebigrims]

ive done one and had the same problem, the thing is the inner most bolts on the lower control arm arent tight enough...trust me tighten them way tight and it will go away.....the first 300c i lowered did the same thing and i cranked down on it and it went away...in case you havnt done that other than that maybe your hitting dead coils...then i would recommend removing them and putting in cut rubber hose on the last few coils to stop from hitting. just a suggestion, ive lowered quite a few now so im pretty sure thats your problem, something just isnt tight enough!