hey guys i installed a set of the BC racing extreme drop kit coilovers yesterday with a friend and the rear is super bouncy with the strut set to maximum stiffness. off the car the strut compresses fine but once on the car its bounces like a blown strut.
any ideas what could be wrong? let me asap as were completely stuck.
car is an 08 SI.

 

You left out a piece. Looks like a washer but thicker.