what you are refering to is a camber adjustment kit. since on our hondas, we cannot adjust the camber to our liking.

and like shivers said, everytime to take apart and replace something in the suspension, the camber, caster, toe settings change. that will lead to alignment and tire wear problems.

i am riding on ITR springs, which is slightly lower than my OEM non-type springs. i still use a ingalls kit in front, and shims in the rear.

IMO, a 2.5" drop is a drastic change in height. i would suggest you get a camber alignment kit, swap the springs, and take it to an alignment shop RIGHT after you put the new springs on.