Fitted coilovers, now knocking from rear?

[colm_gti]

Fitted a set of coilovers recently, and ever sice I put them on the car, I get a knocking noise from the rear of the car when the springs compress after a dip or bump in the road.

The rears are about halfway on the height adjusting collars, nowhere near decked.

Have been under the car a number of times looking for possible contact points, and can't seem to find what would be making the noise.

Any suggestions?

 

[Gaz_]

Rear beam hitting the exhaust whilst compressing?

 

[m_jonathan24]

It could be something as simple as the suspension top mount being loose, they have a habit of becoming loose after about a week of fitting.