I belive DYNOJET do a TRE too, but rather than fooling the ECU into thinking it is in 5th it stops the signal from getting to the ECU.
The problem with most of the TRE's is that by fooling the ECU into thinking the bike is in 5th, the bike then runs the fuel map for 5th gear....especially with the SUZUKIS as they are 3D mapped for gear aswell as load and throttle position.