Yes, send the original file to them as soon as you can. They try to be quick on returning you the calibration, but to eliminate any down time send it to them right away. Just install the SCT software on a PC. Then connect the SCT to the car and read the current file. Once completed, connect the SCT handheld to the PC with the installed SCT software and save the original file to your computer. Then email Magnuson the file with all your information (Name, Vin, Mileage, Etc). Then they will send you a modified file to load into the handheld. All you need to do is reconnect to the car and install. Hopefully you get the file back by the time you are done installing.
And the balancer bolt is extremely tight, that's the hardest part.
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URR2SLO - If you're not going fast enough, get out the way......
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