I'm lowering mine tomorrow - and until now had not seen anything about cutting the bump stops.
I didn't see that anyone was able to explain why it is necessary, and the do/don't pro/con?
Thanks!
EDIT: Nevermind, reason explained here:
http://www.camaro5.com/forums/showthread.php?t=61709
EDIT2: For Eibach users I found: "The Eibach instructions specifically tell you not to cut the bump-stops."