I have an 18" wheels with 235/35 front and 285/30 rear. I want to stiffen the car, next week I`m mounting new shocks, koni at front and bilstein rear. poly antiroll bar mounts, also I will put delco performer springs at rear, I dont want eibach spring because I dont want to lower my car. beside that I want stiffer suspension, better handling in corners I have two problems: sometimes when I accelarate rapidly my rear wheels hop, thay just bounce up&down, an sometms when I hit wholes in road rear tires are hiting rear hitting fenders, (mhm i think Its called fenders so I have to eliminate that two things, I want stiff rear espacially. what else can I do to eliminate those prblems? what a lift bar? I ve seen it somewhere in summit

 

get some Lower Control arms (LCA) for the wheel hop and are the rear wheels hitting if so its not fenders its quarter pannels. you might need to pull the wheel off and see where its hitting and take a hammer and beat it in some.