Alright. So I have a 170 lbs speaker box in the back of my grand prix. I hate the sagging and ride. I want a cheap solution. I thought I found one. Its called Air Lift. It's about $80 per set. Not bad at all. I wouldn't bother paying that at all. But every single site I go to they don't have any for anything over like a 1987. Can you guys help me out here and maybe list some suggestions? Greatly Appreciated