On my H2 SX I had Hilltop remap my ECU. I gained about 10% more in the mid range and about another 5 bhp at the top end, up from192 bhp to 197bhp. I have the dyno charts somewhere and my "seat of the pants" dyno really noticed the difference.
I then discovered that Kawasaki neutered the H2 SX above 9000 rpm. Even though the throttle is held fully open, the ECU starts to shut the throttle butterflies so that at 11,000 the engine is only getting about 20% throttle. The red line is 12,500 rpm. Hilltop wouldn't remove this restriction so I sent my ECU to Florida as there was a very highly recommended tuner there. He flashed my ECU to remove the restrictions, and also change the 3 modes.
The original modes gave the same bottom end but neutered the top end above 6000rpm in low to give 100bhp, 8000rpm in medium to give 150bhp and full power high
The new modes all gave full, un-neutered throttle across the whole range but with a much gentler delivery and tuned for fuel economy in low, tuned for power rather than economy with a slightly gentler delivery in medium and "balls out", smack you in the face, raw grunt in high mode. I think high is actually too much for general road use. Just a wiff of throttle and the bike is off like a scalded cat. Great for track work or if you really want to go for it, but a little too much for general riding in traffic. On the road, I normally ride in medium which actually has the same "headline" dyno output (219bhp) as high
As you can see, very much a total reprogramme of the ECU.
ETA correction of mistype of final bhp value