Chirp from rear suspension

[Lee Levitt]

I'm getting a chirping noise from the rear suspension of my S6 avant when I
go over bumps. The car has an Eibach/Bilstein setup and has a Happersized
rear bar.

It seemed to start when I had an alignment done about a week ago. I also put
my summer tires on about 2-3 weeks ago.

Thoughts?

Lee
'95.5 S6 avant (Bilstein/Eibach/Euros/HID/BIRA S3)
'96 A6 quattro avant (Euros)