They are a 1.25 inch drop in the rear and the car is noticably quicker at the track in the first sixty foot time due to more weight on the rear. And on the street I know the front stock coils are of a different rate. But I notice no difference in ride quality when going over bumps or around curves except for better handling. The rear tires I am running are 245 45 19 so they are around one inch taller than the front ones. Maybe if I was road racing it would not handle as well. But so far so good and for drag racing it is great! these are the bmrs which they sell seperately.