This is Peter's (BlackThundercat on the Forums) 2002 Cat. Though it's mostly stock, Peter summed it up best by saying this: "I have chosen to put my money into high quality riding gear and accessories instead of mods to the bike." Well said!
Modifications he has done include a Sigma digital speedo, frame sliders, a half tank bra customized with Raider patches and Rocket Pillow tank bag for freeway riding. Peter also took the time and effort to add the UK spec "Thundercat" logo underneath the YZF on the fairings sides. He does many group rides in the the Northern California area and has even started a group of fellow YZF'ers called the Nor Cal YZF600Rs.
If you're in the area, look him up through the forums. If not, click here to see some shots of his amazing group rides. There's some great pics in there!