The list is long. Because I'm on my 3rd warranty engine Ducati and the local shops have tried to compensate for my troubles with mods and deals on parts. I also love to socialize and haggle so I've gotten some good deals from Seattle Ducati and Motocorsa in Portland. Besides having a lightened and balanced crank, cf intake and airbox mod with high flow filter, FBF cf slip-ons, my biggest change are the Dymag cf/mag wheels with wave rotors. Huge difference there. My brother has my old 748 and when we go ride together we can swap bikes and notice a tremendous difference. We both also have Heli bars that are a couple inches higher and wider than stock and very comfortable. And of couse we've also geared our bikes down. Are you familiar with comon mods for our bikes and do you plan on any? I remember a shop owner joking around with me years ago about how doing mods can be almost neverending. I laughed and replied that I really didn't need to do anything else after the slip-ons and bars. Haha Guess it's not all about needs is it? Before I got the S4R in Dec. I was still looking for stuff to do and went with the 520 conversion and a RCS titanium shock spring on the rear Ohlins. See ya, MH