yeah man without isolators you will have a really rough ride. i took the upper spring pads out on my bmw to get a little lower stance and to help on the track. i tried to drive it on the street and the next day the pads went back in.
with 3'' spacers, i dont know man. im not a big fan of spacers at all. just put some 3'' lift coils in there, like the ones that RE sells and ditch the pucks. you will need longer shocks if you only have oem ones. even if they are new you will kill em fast.