I know it is a different engine, but Eurosport Cycles made well over 100 hp with a Thruxton and 988, NARK, CR carbs, head work and 2 into 1 pipes. Not 100% as I'm going from memory, but I think the dyno sheet said 109hp.
2002 Bandit 1200/ GSXR cams/ 1277 BB Kit/ Holeshot header and can/ 38mm flatslides/ a good head/lotsa hp/lotsa tq- lots of rear tires...