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Hey buddy. No boost gauge, Callaway tells me about 7 pounds as well. As far as a tune, I'm told Justin at Black Bear Performance is the man for GM tunes. I'm told that these LS motors, in our case the L9H, have pretty good knock sensors and they will retard your timing if they sense detonation. That might ease your mind a bit. If you end up doing a boost gauge let me know how that works out, I may follow suit. You sound just like me, I get 540HP under my right foot and within a week I'm thinking "a little more"...