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Tuners don't need to be connected to the truck for the tune is be in place. They erases the stock program from the EEPROM (electronically erasable programmable read only memory) and replace it with a high performance tune.
Correct for the most part. Some specialized tuners don't vin lock, such as sniper's. I got two vins with purchase. Professional Dyno tuners have unlimited or can buy more vin spots for their software.
However, the typical Superchips, Edge, Diablo, ect do vin lock.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.