If i took off my six-gun would the computer be stock. I want to get EFI but i want to make sure that it will work after i get rid of the six-gun. also would i have to remove anything else from my truck to sell the six-gun? I wouldnt want to sell it to someone and then have it not work.

The Six-Gun doesn't change any ECM (computer) settings, it alters info that it receives...If you remove it to sell, the buyer will be able to use it without any trouble...EFI Live reflashes the ECM with parameters that you want to use...You won't regret buying it...