| I would take a shot and say your buddies got a livewire in his truck? great for ford, its on the same level as EFI and custom tunning... but for your truck if your just looking for mileage i think hondarider is right go with the quad stealth 2 i like mine can be picked up around $300
edit: EFI live and SCT are the same concept, EFI live is the primary custom tunning platform for the duramax.... while fords custom tunning is SCT, the quadzilla stealth II is a handheld tuner for about $300 good option if you just want a little extra power and gas mileage
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