Well I am kinda new to all the new technology the S197's have compared to an old pushrod motor. I have an 07 C/S GT and it has very few mods that include JLT CAI, STEEDA AXLEBACK STEEDA UDP AND A XPIPE and I have been using the stock sct 93 tune and i ordered a tune from Vmp and I dont know if I should be disappointed or it is reality but I really cant tell much difference in the car. I was told the tune was for throttle power and driveability. Should I be able to tell the difference between an Vmp tune and a stock sct tune? When I ordered the tune I told him i wanted a 93 tune and as aggressive as possible without giving up driveability. I also mentioned I was not really worried with mpg. Any suggestions would be great.