hi all. i have lowerd my sri on 40mm lowering springs with std sri dampers.at hight speed above 100 it feels unstable where as before on the std springs it felt solid. also when i go over bumps i get rattles and horrible noises like the car is falling apart. has any body else had simular problems lowering on just springs. also what do people recomend on how to resolve this. i was thinking of changing the shocks and springs with koni's? is this a wise desicion?