Best tuner for 2004 chevy 8.1L?

[recycleoldgrowth]

Wondering what you all think would be a good tune for my gas hog. Not looking to brake the bank here. Tell me what you know about what the gains may be, thanks in advance.

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[Graystone]

Custom tune by a good local tuner if one is not around you blackbear. Don't waste money on garbage handheld shit