Can anyone tell me where to find the $42 calibration file for tunercat. Or do i even need it. Runnin out of time for next race.

 

Go here:

http://www.diy-efi.org/gmecm/

Click on the FTP link and then find the files you want. Tuner Cat includes the 747 $42 ECM definition file with the software. At the DIY EFI site there are hundreds of calibration files for most GM ECMs.