what is the unit pro link system, and does it come stock .i just bought a 06 cbr 600rr. my first bike and im a car guy converting over . some help would be great. thanks

It's the shock system, and yes, it's stock.

Here's a Sport Rider article from the Honda press materials for the 2003 CBR600RR when it came out: Link (http://www.sportrider.com/bikes/2003/146_03_honda_cbr600rr_unit_pro_link/index.html)