This turbo transformer thingy is the same as those gas pedal signal amplifier, you will feel the car has more power after installing it, but after a few tank of gas, the PCM will adjust and adapt, so it will be back as normal, if you want more power, get a tune.
I started using SCT about 6 months right after I bought my car, I re-installed the stock tune every time I go to the dealer for service, it is almost 3 years now and the dealer haven't discover I am using non stock tunes.