i made lowering brackets for mine them relocate the bottom mount of the rear spring it droped it 3 inches i haven't had any problems and i didn't alter anything on the bike so u can take them off and put it back stock no problem i made them from some angle iron from TSC search the "lowering rear" post and you will see

2005 America 145 mains, , #48 pilots, , k&n pod filters, ported intakes manifolds, nology coils and wires, pro com CDI, 62 HP at wheel 68,000 hard miles still runs great gone "traded"