i got the suspension squeaking noise too... and i found out that it is due to the cold weather... on hot days it doesnt make any noise giong over speedbump or bumps but on super cold days i can hear it... i live in canada btw...
i live in Guam and its hot over here and i here that squeaking noise every time i hit a pot hole or some sort of pump.
mine was squeeking as well with the megans and when i called megan they said it's that we have mcpherson suspension so when the spring moves the strut moves with it. they suggested greasing the top and bottom rubber spacers where the spring touches the strut. they say it's nothing to worry about, but time will tell