I don't think there is any modification to a 6.0 v8 AWD Suburban other than fully inflating the tires which is free, that will ever pay for it's self if you choose to drive 80 mph. Mcrews did him a favor of being honest with him, otherwise he'd be wasting his money.
Come on belly pan, changing the bumper, changing the rear gears (it's AWD), none will ever pay for them selfs.
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