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When I bought my tune I had to send ford the vin#, tire size I was currently running as well as the gear size. They processed the info. and sent it back for me to get installed.
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2007 SHELBY GT CSM073649
1992 Black on Black Vert lx 5.0
1985 Chevy c10 383 stroker
2000 Jeep Grand Cherokee 4.7 (daddy mobile)
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