Cyclone, S1's, S3(thunder bolts) carbed. (im not sure if ne later model thunderbolts were FI but i dont think they were. X1's are FI.
I know my M2 was rated @ 92hp and 86 ftlbs of torque. I beleive the earlier tubers has less free flowing cyclinder heads and made a lil less power. I think it was 2002 when the began using the "thunderstorm" head design.
Here is a pic of my 2000 M2.These pics are about ten years old. Swapped to an S1 tail (one of the only good parts left after O totaled my S1), Chain drive,(whicj you cant see in the first pic), hand made my own rearsets, S1 front fairing, ASB clip-ons,Buell race kit, intake,ignition, and V&H muffler.