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on 9/5/15I spoke to Same Guy If U have a little Box with a power Knob on it and 2 02 Surge Chips then its stage 3 and DONT listen these peoples crap they putting them on bs not 350s I have a 98 Silverado on 40s with 22 rim and I can smoke them no problem now just make sure arrow facing the ECU or motor not the 02 sensor and good ground set power to Max and floor it... Let me know u think...