So first thoughts on this is that the customer service is excellent William Worley always responds quickly to my emails with the information i need. I went for the base flash because the only other performance mod i have is a downpipe as of now. This tune absolutely rips it really gives the car what it needed from Hyundai! Flashing it over was very simple even though i never saw the green button come on from the device to let me know it was done flashing (i did hear the click). I did pick up a prosport boost gauge to monitor the levels im at ive seen tops around 15 but i feel the gauge needs to calibrate and read proper boost levels to what the tune is capable of. One thing that had me confused was that i went to go drive my car later in the afternoon and it felt as if i hadn't tuned it at all. I was below a quarter tank of gas which i feel it makes the car drop a lot of boost but after i filled back up it was back at the level i had felt it earlier in the day. Overall i love this flash and i would recommend it to anyone.