Hi there ! There is a lag on the motor to be able to have a safe response on acceleration .
What the booster did for me was a quicker response and it seems like the rpm held up a bit higher making my driving experience enjoyable , the thing I like the most is when I have to make a lane change the car responds a bit quicker than it did. I think that is safe to say that I did not gained any horse power but I go it what have , now rather than later . I think that I got my money worth out of the deal !!!!