If you are going to do a true with and without Sprint Booster test... make sure you reset the learning accelerator pedal BEFORE each run.

To be fair, this is the real reason for the 'lag' without the Sprint Booster. The system learns your habits and starts to anticipate them. When they don't conform (smashing your foot to the floor) it gives a lag time for you to correct the 'mistake'. Call it what you will, this is a safety feature for the average driver when you have a light vehicle with this much horsepower.

On the SRT6, it still catches me by suprise if I try a bit of a jack rabbit start.