First, I wouldn't consider lowering the front end two inches, for both practicality and safety reasons. But if for some crazy reason I decided I wanted to give up a lot of ground clearance and scrape a lot of parts, I'd at least lower the rear the same amount as the front so I wouldn't totally screw up the geometry (rake and trail).
Second, not all CVO's come with lowered suspensions. For instance, the Ultra's have the standard length shocks and forks. But the comment about checking first is a good one. Throwing the wrong components in the legs and buttoning everything back up is definitely not a great idea. And don't automatically assume the guy selling you the parts knows what you have, I've heard several mention totally incorrect information they received from sales folks at the various suspension companies and retailers, and even totally bogus information from (gasp!) the guy at the Harley shop.
When the SEEG's came out, Harley made it very clear that both the front and rear had been lowered 1" with parts from the accessory catalog. Since that time, they have been less and less clear about the suspensions on the CVO's, and before I made a change that could cause a high speed stability issue, I would want to be very certain what I was starting out with and the compatibility of the proposed change.
Jerry