on a Z. The stock 2012 Z06 puts out 505hp and does the 1/4 mile in 11.7. Those I mentioned above were tuned to 630 to 640hp by Specialty Z in Delaware. Philly Z told me at an ECZA meet years ago He was running low to mid 10's in the 1/4 mile at Atco raceway. The difficulty being the 2 to 3 shift sending the car nearly sideways as it went down the drag strip. But to get the Z to that point will cost a great deal, thats all I meant. If you are going to upgrade the Z06 then yes no question the Lingenfelter, Hennesey, Vette will be more powerful but that's not what I read.