I installed Ivan's Smart TRE a few weeks after I bought the bike, a new 04 model. Before the TRE I noticed a slight sluggishness in the low gear low rpm range because of Suzuki's soft mapping. But after the TRE I got a NOTICEABLE increase in acceleration, to the point where I have to be careful, especially turning onto roads from a dead stop. But my bike really kicks ass in the acceleration department. Also, the 6th gear "governor" is gone, so when asked how fast the busa can go, instead of saying "186 mph", I can say "close to 200 mph". It dampens the ladies, not that I'm in the market for a damp one, OK Wifey!