Hi Coolride,
I have the Tein super streets with top mounts, think mine has been lowered about 35+ mm on 18's and mine was very close to the limit on the camber. If i went any lower than the camber is not retrievable and i would of had to fork out on adjustable arms etc etc.
It can go very low, just all depends on roads!

Even though mine is only lowered 35ish mm i still bottom out over several roads, bumps etc. plus i have cusco under chassis braces on the way so will be even lower, and front will catch on everything when i have the new lower front fitted
as azted has said, speak to the master himself
Jason