I have a 09 696 which I had the Termis installed. If they added power it must be slight because I don't notice it. It has given the bike a better delivery of the power. There was some flat spots in the power curve and the Termis seem to have made the power curve smoother. I read about the jump in the rpm limiter but it didn't happen on my bike. It still bounces off the limiter around 8500. The sound is better even with the baffles in (to loud for my neighbors without) and without it sounds great if you can get away with it. I enjoy the bike more with them Termis mostly because of the improved power delivery.
Jim.
when you turn on your bike does it read "Monster 696 Racing" on the dash?