it depends on how low your car is. awhile back i took my integra to gran tourismo and it was too low for them to align. i didn't consider my car slammed back then but it was pretty low...

only spot i found that could do it then (and that i still go to now) is kauffman tire up in alpharetta. their alignment machine is sunken into the ground so you can drive right on it (no ramps). they do a pretty good job too...