I found out today thats a chevy S10 so he is going to get it tomorrow

. Should i also have the tow/haul ON or OFF. I know i going to use the tow tune(custom) but didnt know if i should have the tow/haul on or not.
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40 series Flowmasters, K@N CAI, Jet MAF, Troyer Under Drive Pulleys, Stainless Works Longtube headers/Hi Flow CATS w/X-pipe, Ram Air Hood G-Force, SCT X3 programmer with custom tunes