Originally Posted by DirtyD
There is a difference in the SF3 and X3. SF3 comes preloaded with tunes from SCT. X3 is strictly a custom tune only device.
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hmmm, I am able to add/remove tunes at my leisure using sct device updater program using this device.
This tuner was originally purchased from American muscle with their 3 custom tunes. I have run email tunes from VMP, AED and custom True Street tunes.